Answer:
rhe answer is that the rocks of that time are buried deeply under the soil.
The factor that prevents us from finding fossils from the Precambrian era is that life-forms in this era had no skeletons. Therefore, option (A) is correct.
What was Precambrian era?The Precambrian era spans from the formation of Earth about 4.6 billion years ago to the start of the Cambrian period about 541 million years ago. During this time, life on Earth consisted mainly of simple, single-celled organisms such as bacteria and algae.
These organisms lacked the hard shells, bones, and other structures that are typically preserved as fossils. Therefore, the fossil record from the Precambrian era is relatively sparse, consisting mainly of impressions and other traces left by these early organisms in sedimentary rocks.
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How many of the offspring are heterozygous?
How do humans affect the carbon cycle?
Using pencil to write,exhaling carbon dioxide, wearing sunscreen or inhaling oxygen?
NEED HELP ASAP
Answer:
both
Explanation:
it a affects the carbon cycle both ways
People and animals living in low-lying areas of Lake Nyos in Cameroon, Africa, were killed after carbon dioxide escaped
from the lake and moved across the land. This is an example of
a. how human activities can affect humans and the environment
b. the fatal consequences of industrialization
C. how natural processes can introduce harmful materials into the environment
d. the dangerous effect of livestock competition
Answer:
C. how natural processes can introduce harmful materials into the environment
Explanation:
Creosote bush's resin is foul smelling that prevents grazing.
O True
O False
Need help answering this Neurons are constantly firing on a regular basis in order to keep your body functioning. In your words, describe how a neuron utilizes a stimulus to create an action potential. (Be detailed)
Answer:
Action potentials are generated when information are sent down an axon through the neuron.
Explanation:
Neurons are nerve fibres which uses electrically charged chemicals to bring about an electrical change.
Action potentials can be defined as rapid changes in the membrane potential that spread rapidly along the nerve fiber membrane. Each action potential begins with a sudden change from the normal resting negative membrane potential to a positive potential and then ends with an almost equally rapid change back to the negative potential. The are three stages of action potential, these include:
--> Resting stage: This is the resting membrane potential before the action potential begins. The membrane is said to be 'polarized' during this stage.
--> Depolarisation stage: in this stage, the membrane suddenly becomes very permeable to sodium ions, allowing tremendous numbers of positively charged sodium ions to diffuse to the interior of the axon. That is, the normal polarised state, for example -90 millivolts, is immediately neutralised by the inflowing positively charged sodium ions, with the potential rising rapidly in the positive direction. This is called DEPOLARISATION.
--> Repolarisation stage: This occurs within a few seconds after the membrane becomes highly permeable to sodium ions, the sodium channels begin to close and the potassium channels open more than normal. Then, rapid diffusion of potassium ions to the exterior re- establishes the normal negative resting membrane potential. This is called REPOLARISATION of the membrane.
How is antibiotic resistance related to natural selection?
Answer:
Antibiotic resistance is a consequence of evolution via natural selection. The antibiotic action is an environmental pressure; those bacteria which have a mutation allowing them to survive will live on to reproduce. They will then pass this trait to their offspring, which will be a fully resistant generation.
Hope this helps out.
Explanation:
Assume that (B) is dominant and (b) is recessive: Bb mates with Bb
A. About 50% of the offspring will show the recessive trait
B. All the offspring will show the dominant trait
C. All the offspring will show the recessive trait
D. About 75% of the offspring will show the dominant trait
If B is dominant over b and Bb mates with Bb, about 75% of the offspring will show the dominant trait.
Looking at the cross:
Bb x Bb
BB Bb Bb bb
BB and Bb will show the dominant trait while only bb will show the recessive trait.
Thus, the chances of the offspring showing the dominant trait would be 3/4 or 75% while the chances of showing the recessive trait would be 1/4 or 25%
More on chances in genetic crossings can be found here: https://brainly.com/question/2236332
Two genetically identical plants were crossed. The genotypic ratios of offspring are seen in the Punnett square
What percent of the offspring should look like the parents?
This is science btw
Answer:
Its below
Explanation:
75% of them will have the dominant trait and 25% will have the recessive trait.
Your question was a bit confusing. Does my answer satisfy it?
What do Ebola victims usually die from
Answer:
People who die from infection with Ebola virus usually end up dying from multi-organ failure and shock.
Explanation:
The shock is from the bleeding -- now you're bleeding in different parts of your body, and the blood is leaking out of your blood vessels
Answer:
★ Bleeding from immune system overload
Explanation:
Hope you have a great day :)
please help me!!!!?????? 15 points??
Answer:
(2) erosion
Explanation:
Water wears away at, or erodes, stuff.
Have a great day!
during the process of cellular respiration, energy is released from(1)Carbon dioxide (2) Oxygen atoms(3)Water molecules (4) chemical bonds
Answer:
4) Chemical Bonds
Explanation:
A pyramid of numbers for the wetland ecosystem showed that there were very large numbers of organisms at the base of the pyramid and very few at the top. Explain why
Answer:
hmm... i dont know
Explanation:
In which phase do daughter nuclei began to form at the ends of the cell?
PLEAS DONT DO IT FOR POINTS I AM REALLY LOW
A. Interphase
B. Metaphase
C. Prophase
D. Cytokinesis
E. Telophase
F. Anaphase
Daughter nuclei begin to form at the ends of the cell during telophase
In certain breeds of dogs, deafness is due to a recessive allele (d) of a particular gene, and normal hearing is due to its dominant allele (D). What percentage of the offspring would be expected to have normal hearing if a normal heterozygous (Dd) dog and a deaf dog (dd) mated ?
Answer:
50%
Explanation:
Answer:
50%
Explanation:
I just did the quiz
Green seed color (G) is dominant over yellow seed color (g). If two heterozygous parents are crossed, what are the resulting phenotypes expressed as a percent?
A) 50% green, 50% yellow
B) 75% green, 25% yellow
C) 50% GG, 50% gg
D) 25% GG, 50% Gg, 25% gg
E) none of the above
Answer:
B) 75% green, 25% yellow
Explanation:
There are three genotypes made from crossing two heterozygous parents (Gg);
GG
Gg
gg
Crossing two heterozygous parents (Gg) results in 50% Gg, 25% GG and 25% gg. Since green (G) is dominant over yellow (g), there would be a total of 75% green and 25% yellow.
I would appreciate brainliest, if not that's ok!
What was a goal of Confucianism? HURRY TEST
what are the different cellular organelles
Answer:
Plasma membrane, nucleus, ribosomes, mitochondria
Explanation:
what does the theory of evolution state
Answer: In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species? are related and gradually change over time
Explanation:
Long chain of _________________ that surrounds the Pacific Ocean.
Answer:
Circum-Pacific belt
Explanation:
it is the belt that goes around the Pacific Ocean longest
Photosynthetic organisms produce oxygen based on whether light is available for photosynthesis. These organisms also consume oxygen for cellular respiration in both light and dark environments. In three to five sentences, explain how these conditions relate to gross and net
productivity. (4 points)
Answer:
Gross productivity refers to the amount of carbon fixed.
Explanation:
Gross productivity refers to the amount of carbon fixed during the process of photosynthesis by all producers such as plants and algae etc in the ecosystem. A large part of the energy that is produced in the process of photosynthesis is used by the plants in the metabolic processes of the producers such as respiration. The net productivity indicates that carbon dioxide plants that is used during the photosynthesis process substracted from carbon dioxide the plants releases during the process of respiration.
Answer:
be care if use answer ^ got in troulbe reword it really good
Explanation:
Please tell me what goes in the top blank, and if you could, tell me if I put the other stuff in the right blank!
Explanation:
I could but I would need to know the question is that you need to solves put the answer in the blanl
A population of crabs live on a light-colored sandy beach. In this environment there is a population of birds that eat the crabs. One year, there is a volcanic eruption near the beach and dark volcanic ash covers the beach. The sand is now much darker than it used to be. Scientists studying the area are most likely to predict which outcome?
A.
Some of the light-colored crabs will try to change their body color to be darker and pass on those traits to their offspring.
B.
Some of the light-colored crabs will try to change their body color to be lighter and pass on those traits to their offspring.
C.
Some of the crabs born with the body color traits that do not allow them to escape the birds will likely survive and pass on those traits.
D.
Some of the crabs born with the body color traits that allow them to escape the birds will likely survive and pass on those traits.
Answer:
Your answer is D).
Explanation:
If the crabs are able to avoid being eaten by the birds, then they are most likely darkly colored to blend in with the dark ashen sand, and as Charles Darwin theorized: survival of the fittest.
P.S.- After the birds leave for the day, the crabs can finally get back to vibin' on the beach
PLEASE HELP!! WILL BE MARKED BRAILIEST
6. phylum (or division) of fungi commonly known as "sac fungi" which includes
morels and yeasts*
Ascomycota
ascus
Basidiomycota
budding
Answer:
Answer is Ascomycota.
Explanation:
I hope it's helpful!
Why is it important that the stigma be made of a sticky material?
Answer:
Most stigmas are covered with a waxy, sticky substance. This wet substance allows stigmas to provide an important service by re-hydrating dry pollen to prepare the grains to enter the ovary and initiate the process of fertilization.
Explanation:
I hope this helps. ^_^
But do not copy this or I will report you. I swear.
What is used to cut the chromosome open?
Answer:
Restriction enzymes
Explanation:
In one student's family, two of the children have curly hair, one child has wavy hair, and the fourth child has straight hair.
Which of these processes is responsible for the variety of hair texture in this family?
Answer:
A. sexual reproduction
Explanation:
The inheritance of multiple phenotype genes that is the mother will have heterozygous as well as the father will have the heterozygous condition as well. The process is included in genetics and the genetics is related to it.
What is genetics ?It is defined as the study of genes and study of genes expression along with all the genetic factors associated with it.
The expression of the hair that is expressed in the progeny of the parents where the multiple expression is present can show incomplete dominance as well where none of the phenotype that is the alleles and the genes that are present in the parents will not express it in the child.
The process is also called as recombination where both the traits re expressed in the child and the characters both associated with the parents will express in the child.
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An ecosystem receives plenty of rainfall, ending a drought which decreases the number of limiting factors in the ecosystem. What will happen to the biodiversity of the ecosystem if this pattern of increased rainfall continues over the next several years?
Group of answer choices
biodiversity will increase
biodiversity will decrease
biodiversity remain the same
Answer:
Biodiversity will decrease
Explanation:
because if the rainfall continues it will make some of the species leave to find a different place to live which will throw the ecosystem of that area off. Hope this helps
PLS HELP ILL MARK BRAINLIEST!!
9. What are the three names commonly used to refer to the places where electrons can be
found?
10. Approximately,
manmade.
elements are found naturally on Earth. The others are
11. How does the Periodic Table organize elements? (2 answers)
12. The atomic number is
13. The atomic mass is
14. The Periodic Table is arranged in order of
The number of protons
Increases from left to right.
15. The vertical rows of the Periodic Table are called
All of the elements in a vertical row have similar characteristics.
I
Explanation:
9 The center of the atom is called the nucleus. Electrons are found in areas called shells. A shell is sometimes called an energy leve
12. 6
13. The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D).
14.Elements are arranged from left to right and top to bottom in order of increasing atomic number.
15.The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. A
10.Of these 118 elements, 94 occur naturally on Earth. Six of these occur in extreme trace quantities: technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.
A dumping site in the small town of Love Canal, New York, was used for the disposal of industrial chemical wastes from 1970-1975. In 1980, the housing inspector noticed traces of toxic substances in the basement walls of the local schools and homes. The local hospital noticed that there were 25% higher numbers of birth defects during 1970-1980. The hospital then offered free genetic tests and found that 20% of the adult volunteers/residents of Love Canal contained genetic abnormalities. The exposure to those industrial chemical wastes must have been the cause the genetic abnormalities and higher birth defect incidence. Your Interpretation:
Answer:
There is no control group and variables were not addressed.
Explanation:
In the context, it is given that there is a dumping ground in a small town called Love Canal and harmful chemical waste of industries are dumped there. Lately, it is noticed that there were traces of the toxic substances on the walls of the schools and the hospitals. The hospitals also noticed that during the period of 1970 to 1980, there were increase in the number of the birth defects in the area. The people of the Love Canal has genetic abnormalities and the chemical waste is responsible for it.
Thus it can be concluded that there is a no such any control group in this case. The confounding variables like the comorbidities as well as the family history of the genetic defects were not addressed.
ACTIVITY 2: NOW I KNOW!
Directions: Complete the paragraph using the word pool provided. Write the word in your long pad.
MIRROR
OBJECTIVES
PENCIL
MAGNIFICATION
EYEPIECE
INVERTED
GLASS SLIDE
COVER SLIP
10X
FIELD OF VIEW
40X
UPWARD
The microscope is an essential tool in Biology. It provides us with important data on specimens being examined.
The (1) has various magnification (5x, 10x, 12.5x, 15x) which attaches to the body tube. On the other hand, the
revolving nose piece are attached by (2) with 10x, 40x and 100x magnifications.
In preparing a wet mount, place the specimen in a (3)
add a drop of water and cover it with a (4)
Tap the cover slip with the eraser-end of a (5)
to reduce the formation of the bubbles.
Look at the eyepiece and adjust the (6) to find the (7) of the microscope which is the bright circle
of light. The (8)
of specimen is computed by multiplying the magnification of the Eyepiece with the
magnification of the Objectives. If the eyepiece has a magnification of 10x and the Objective has (9)
then
the specimen's magnification is 400x. In addition, turning the stage knob upward will result to moving the specimen as
seen in the microscope downward while turning the stage knob to the left will move the specimen to the right as seen
under the microscope. Finally, the specimen when seen under the microscope appears (10)
Answer:
The correct answer would be -
1.) objectives
2.) eyepiece
3.) glass slide
4.) coverslip
5.) pencil
6.) mirror
7.) field of view
8.) magnification
9.) 40x
10.) inverted
Explanation:
Objectives of the microscope have magnification (5x, 10x, 12.5x, 15x) which attaches to the body tube. The nosepiece is found between the stage and the eyepiece or ocular lens. Glass slide is the slide where a specimen is placed for the study and covered with a coverslip, bubble should be avoided while placing the coverslip.
Mirrors need to adjust to seeing the field of view by adjusting the light. After computing the magnification there would be a final image of the specimen that would be inverted due to the two lens used here.