Answer:
The correct answer is option B, that is, an endoskeleton evolved to enclose the dorsal nerve cord, which develops from the notochord.
Explanation:
It has been discovered that the ancestors of the modern-day fish were vertebrate chordates. The vertebrate chordates are considered to have evolved from the invertebrate chordates that are identical to the present day tunicates. It has been found that in vertebrates the endoskeleton has evolved to encompass the dorsal nerve cord that has been developed from the notochord (a characteristic of invertebrates).
what single factor limits the size that most cells are able to attain
Answer:
The surface-volume ratio.
what factors are examined by the field of demography? check all that apply.
Answer:
Demography is the statistical study of human populations. Demography examines the size, structure, and movements of populations over space and time. It uses methods from history, economics, anthropology, sociology, and other fields.
Individuals joining a population is an example of emigration / immigration
Answer:
immigration
Explanation:
How are thorns and spines related to drought resistance?
Answer:
To survive in drought conditions, plants need to decrease transpiration to limit their water loss. Some plants that live in dry conditions have evolved to have smaller leaves and therefore fewer stomata. Extreme examples are plants with leaves that resemble spiky thorns or spines.
what should you do if you are not sure that an organism is a plant
Answer:
An organism refers to a living thing that has an organized structure, can react to stimuli, reproduce, grow, adapt, and maintain homeostasis.
Explanation:
An organism is a plant.
If you are not sure that an organism is a plant, you should observe and research the characteristics and behaviors of the organism to determine its classification.
What is the five kingdom classification?The five kingdom classification is a system of classifying living organisms into five major categories based on their fundamental characteristics. The five kingdoms are:
Monera: This kingdom includes single-celled prokaryotic organisms, such as bacteria.Protista: This kingdom includes single-celled eukaryotic organisms, such as algae and protozoa.Fungi: This kingdom includes multicellular, heterotrophic organisms, such as mushrooms and yeasts.Plantae: This kingdom includes multicellular, autotrophic organisms that are characterized by their ability to photosynthesize, such as trees, flowers, and grasses.Animalia: This kingdom includes multicellular, heterotrophic organisms that are characterized by their ability to move and sense their environment, such as animals and humans.Learn more about classification, here:
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The duplicity theory of vision holds that a single receptor system cannot produce both high sensitivity and high resolution. What does this theory explain
Given what we know about the Duplicity theory, we can confirm that this theory attempts to explain the functions of the Rods and Cones present in the human eye.
The Duplicity theory of vision aims to provide insight as to the functions of the Rods and Cones in the human eye and how each of these contributes to our everyday vision. The theory also centers around the difference in activity between these two structures.
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what is the funtion of the cilia
The function of cilia is to move water relative to the cell in a regular movement of the cilia. This process can either result in the cell moving through the water, typical for many single-celled organisms, or in moving water and its contents across the surface of the cell.
why is the cycling of matter important to life on earth?
Answer:
It needs to have it
Explanation:
Earth is earth
also known as fat cells, the are predominant in the subcutaneous layer.
A place where animals and plants are protected is called
A) an ecosystem
B) a refuge
C) a sanctuary
D) both B and C
Hello! can someone help me w this pls
what modern day scientist use to learn the Ordovician Period
Rocks from the Ordovician Period contain evidence that plants began colonizing dry land at this time. Most experts agree that the ancestors of land plants first evolved in a marine environment, then moved into a freshwater environment and finally onto land.
Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began 485.4 million years ago, following the Cambrian Period, and ended 443.8 million years ago, when the Silurian Period began. Ordovician rocks have the distinction of occurring at the highest elevation on Earth—the top of Mount Everest.
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How does the mantle differ from Earth’s crust?
Im doing stemscopess HELPPP.
This layered structure can be compared to that of a boiled egg. The crust, the outermost layer, is rigid and very thin compared with the other two. ... The mantle, which contains more iron, magnesium, and calcium than the crust, is hotter and denser because temperature and pressure inside the Earth increase with depth.
40 points!!!!!!Select the correct answer from each drop-down menu.
Humans use many chemical substances for farming that consequently affect biodiversity. These compounds, which are rich in nitrogen
and phosphorus, are used to fertilize crops. Excessive use of these compounds causes
______ , which leads to
_____ in bodies of water.
Answer:
eutrophication and algal growth
True or false ?
The chemical reactions of cellular respiration are anabolic reactions.
O True
O False
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Chlorophyll appears green because it…?
Answer:
Chlorophyll gives plants their green color because it does not absorb the green wavelengths of white light. That particular light wavelength is reflected from the plant, so it appears green. Plants that use photosynthesis to make their own food are called autotrophs.
Answer:
A. absorbs green light
B. reflects green light
C. emits green light
ANSWER: B. reflects green light
Explanation:
our eyes can only see what objects reflect, so if it's appearing green then obviously it's reflecting the green light.
where does reduction occur in an electrolytic cell
Answer: The Cathode
Explanation:
Reduction always occurs at the cathode, and oxidation always occurs at the anode. Since reduction is the addition of electrons, electrons must travel toward the site of reduction. In an electrolytic cell the negative charge is on the cathode, while the positive charge is on the anode.
i hope this helps :)
Answer:
The Cathode
Explanation:
what factors determine if a species is fit to survive?
Answer: variation, reproduction, and heritability.
Explanation: Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population. Genetic variation is advantageous to a population because it enables some individuals to adapt to the environment while maintaining the survival of the population.
All species must reproduce to survive. Organisms cannot live forever, so they must reproduce to allow their species to continue to live on. Reproduction is nature's way of allowing a species to survive.
Higher heritability means the trait evolves faster; fewer generations are required for the trait to increase to the same degree as a trait with lower heritability. For this reason, genetic correlation and heritability show how a trait might change from one generation to the next and into the future.
Select all of the choices that are true regarding tides...
Spring tides occur when the gravitational pull of the sun and moon are in line with each other, while neap tides occur when the gravitational pull of the sun and moon are perpendicular to each other
Tides only occur in the ocean
Tidal forces are primarily caused by the moon's gravitational pull
Larger bodies of water have more noticeable tides
Tidal forces are caused by a combination of the gravitational pull of the Moon and the Sun
Spring tides occur when the gravitational pull of the sun and moon are perpendicular to each other, while neap tides occur when the gravitational pull of the sun and moon are in line with each other
Answer:
a,b,c,e
Explanation:
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Explain the effect of viruses on living organisms.
Answer:
Viruses are microscopic biological agents that invade living hosts and infect their bodies by reproducing within their cell tissue. Viruses are tiny infectious agents that rely on living cells to multiply. They may use an animal, plant, or bacteria host to survive and reproduce
which of the following organisms has the largest surface area to volume ratio?
A) Bactrium
B) Butterfly
C) elephant
Answer:
B) Butterfly
Explanation:
Smaller animals tend to have a larger surface area to volume ratios. Smaller animals have breathing and heart rate faster than that of larger animals.
if an organism is a protostome, what else can you conclude about its body plan?
Answer:
It has two tissue layers.
Explanation:
what is the process of producing energy in living organisms
Answer:
cellular respiration
Explanation:
what are the steps to make beryllium?
Answer:
Beryllium is processed from the ore in four major steps: (1) the beryl ore is converted into a standard grade of beryllium hydroxide, (2) the hydroxide is purified, (3) purified beryllium hydroxide is reacted with ammonium bifluoride for conversion into ammonium beryllium fluoride, and (4) then reduced to beryllium
Answer:
Beryllium is processed from the ore in four major steps: (1) the beryl ore is converted into a standard grade of beryllium hydroxide, (2) the hydroxide is purified, (3) purified beryllium hydroxide is reacted with ammonium bifluoride for conversion into ammonium beryllium fluoride, and (4) then reduced to beryllium ...
Explanation:
hope it helps you
Which molecule is needed for photosynthesis to occur?
glucose
oxygen
carbon dioxide
nitrogen
Answer:
The answer is Carbon Dioxide/co2
Explanation:
For a clearer response, carbon dioxide is one of the substances needed for the process of photosynthesis. Oxygen is not essential because that molecule is what is being released. Glucose is the molecule being produced.
The mutation shown in the sequence below can be categorized as which type?
Original DNA sequence:
A T A C G G T A G C A A
T A T G C C A T C G T T
Mutated DNA sequence:
A T C G G T A G C A A
T A G C C A T C G A A(1 point)
insertion mutation
deletion mutation
chromosomal mutation
substitution mutation
Answer:
Deletion
Explanation:
because one base is deleted.
The mutation from A T A C G G T A G C A A to A T C G G T A G C A A is a deletion mutation.
MUTATION:Mutation is referred to as any change in the nucleotide sequence of DNA molecule. Mutation can be of different types namely: deletion mutation, substitution, insertion mutation etc. Deletion mutation is a kind of mutation that involves the removal of one or more nucleotide base from the DNA sequence. According to this question, an original sequence is given as: A T A C G G T A G C A A, mutation occurs and results in the following sequence: A T C G G T A G C A A. Nucleotide base "A" was removed from this sequence, hence, it is an example of deletion mutation.Learn more about deletion mutation at: https://brainly.com/question/6477597?referrer=searchResults
A chemical reaction in a living cell occurs in the presence of a specific protein molecule. The concentration of this protein molecule remains the same before and after the reaction. This protein molecule is most likely
1. a coenzyme
2. a substrate
3. an enzyme
4. an acid
Answer:
c
Explanation:
When is passive transport used.
Answer:
When a molecule moves down its concentration gradient is it participating in passive transport
what are two terms used to describe organisms such as humans
(ecology)
Answer:
Carnivores omnivores reproducers maybe..lol
Urgent Care Centers are extremely busy during cold and flu season. The influenza virus can causes symptoms such as a cough, high fever, aches, and weakness. It can be very uncomfortable for patients and causes loss of time at work. What is the best way for a person to protect themself from getting the flu?
Group of answer choices
Obtain a immunization before flu season begins.
Drink a lot of fluids and get plenty of rest.
Begin taking antibiotics as soon as symptoms begin.
Take antiviral medication as soon as fever is detected.
Answer:
Obtain a immunization before flu season begins
Explanation:
The question asks for prevention and the other answers sTate what to do when you already have it.
Match the vitamin deficiencies and their symptoms.
depression
dry skin and nails
excessive bleeding
A
B6
K
Answer:
depression: B6
dry skin and nails: A
excessive bleeding: K