Answer:
less than 1%
Explanation:
The approximate percentage of the geologic time that humans have existed on the Earth since its origin is less than 1%.
The earth is about 4.6 billion years and much of its history has been without the present of human activities.
Hominis were the first human to appear on the surface of the earth. This was in the Miocene epoch which was about 6 million years ago. Compared to the age of the earth, this time lapse is very small and not up to 1%. Life first appeared on earth about 3.5billion years. Since then evolution has taken its due course to give what we have today.Plants, algae, and cyanobacteria all release what
as waste that animals use
to breathe.
Plants, algae, and cyanobacteria all release oxygen as waste that animals use to breath.
What are cyanobacteria?Cyanobacteria are the type of bacteria which comes in the category of microorganisms and they are related to the bacteria they are not plants still they are performing the process of photosynthesis. The type of cyanobacteria is blue green algae.
Cyanophyta is the another name of cyanobacteria and they are from the phylum Gram-negative bacteria that used to obtain the energy that is utilized in the process of photosynthesis. The name of the cyanobacteria is depend upon its color and the common name of the cyanobacteria is blue-green algae.
Generally, there are five main types of cyanobacteria and these are named on the basis of their toxicity and they are named as Anabaena Flosaque, Microcystis aeruginosa, Aphanizomenon flosaquae, and the last one is Nodularia species.
Therefore, Plants, algae, and cyanobacteria all release oxygen as waste that animals use to breath.
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A bat is a mammal even though it flies in air why
Answer:
Explanation:
Bats are classed as mammals, but as the only flying mammal, people often ask me why they are mammals and not birds. In this article, I look to find out whether they possess all the mammalian traits. Bats are mammals because they breathe air, give birth to live young, provide milk to their young, have fur, and are warm-blooded.
Answer:
Cause it breathes oxygen
Explanation:
Becasue it does
Write the formula for the population growth rate. Identify all the variables.
Answer: v =59
Explanation:
To calculate the Population Growth (PG) we discover the difference (subtract) among the preliminary population and the populace at Time 1, then divide with the aid of using the preliminary populace and multiply with the aid of using 100.
What is A population variable?It is a descriptive variety or label related to every member of a populace. The values of a populace variable are the numerous numbers (or labels) that arise as we recollect all of the contributors of the populace.
Calculated with the aid of using (Birth Rate - Death Rate) / 10 = Growth Rate in % Natality Rate Number of births/ yr to each one thousand human beings withinside the populace Mortality Rate The ratio of deaths in a place to.
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What are the lines in leaves
Answer:
Veins – The blackish lines in the leaf blade are called veins. The largest black line is the leaf's single “midvein,” running from the petiole to the leaf tip, the smaller blackish lines branching off the midvein are “secondary veins”
List 3 similarities between the 3 types of macromolecules
Answer:
3 Similarities are Carbon, Hydrogen, and oxygen
Explanation:
Please helpppppp will give brainliest
Answer:
Embryotic stem cell research benefits our society with the possibility of it helping various diseases and it only requires a small number of cells. The negatives of stem cell research are the cost and ethical controversary. To start, stem cell research could help with diseases like Alzheimer's and certain cancers like Parkinson's. Also since cells replicate incredibly fast, procedures wouldn't need many cells depending on the case. Stem cell research can vary in costs from about $5000 to $20,000 which for many people is difficult because stem cells are very temporary in many cases. Many groups of people don't agree with stem cell research since human embryos are destroyed in the process of harvesting embryonic cells and it is "potential life".
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Write the names of any two hormones secreted by the adrenal glands with one function of each
Cortisol is secreted by the cortical region of the adrenal gland and it increases the blood sugar levels.
Adrenaline is secreted by the medular region of the adrenal gland and it increases the heart rate.
Ad means upon and renal means kidney, thus adrenal gland is present at the top of the kidney. There are two regions in the adrenal gland,
Adrenal Cortex: Outer regionAdrenal Medulla: Inner regionx------------------------------------------------------------x
[tex]\Large\textbf{Adrenal Cortex}[/tex]
Adrenal Cortex is active all the time but especially in shock or stress condition. It secretes aldosterone, cortisol and androgenic hormones.
ALDOSTERONE: It promotes the retention of sodium ions and release of potassium ions by kidney. It also promotes inflammation as part of the body immune defense reaction.CORTISOL: It brings about an increase in blood glucose level mainly its production from protein and by antagonizing the action insulin.ANDROGEN: They play an important role in sexual development. As they secrete androgen and testosterone so they promote the secondary sex characters such as beards in men and sexual characters in woman._____________________________________[tex]\Large\textbf{Adrenal Medula}[/tex]The adrenal emdulla produces the hormones such as adrenaline and nor-adrenaline. Both of these hormones are secreted in stress condition. THey produce many specific changes in the body.
They produce the fight and flight mechanism inside our body. It dilates the blood vessels, promotes the release of glucose from the liver glycogen, reinforces the effects of sympethatic system, dilates the pupil of an eye.
_____________________________________QUESTION:
The question asks for the two hormones from the adrenal gland, it does not say specifically from which part of the adrenal gland, thus you could mention any hormone from any region of the adrenal gland mentioned above.
_____________________________________Best Regards,'Borz'A group of ecosystems with similar abiotic and biotic features
Biome
Climate
Emergent Layer
Deciduous
Which is a disadvantage for organisms undergoing asexual reproduction?
A. asexual reproduction results in less diversity among the offspring
B. asexual reproduction results in greater diversity among the offspring
Answer:
A - Asexual reproduction results in less diversity among offspring
Explanation:
Asexual reproduction results in less diversity among offspring because it produces exact copies of the parents. In sexual reproduction, two parents offer two sets of genes and allow diversity.
Which molecule carries information from DNA to the place where proteins are made?
a
mRNA
b
DNA
c
tRNA
d
rRNA
Answer:
A.) mRNA ( messenger RNA )
Explanation:
The majority of the human body is made up of molecules that contain H,
C, O, N, and P. In your own words why is a diet of only carbohydrates insufficient for long
term survival?
Answer:
In the absence of carbohydrates in the diet, your body will convert protein (or other non-carbohydrate substances) into glucose, so it's not just carbohydrates that can raise your blood sugar and insulin levels. If you consume more calories than you burn, you'll gain weight.
the cells were kept in a dilute solution. they were then transferred to distilled water. explain what will happen to each of these two cells when they are placed into distilled water.
When you place the animal cell in distilled water, because distilled water is a hypotonic solution(has a lower concentration than the cytoplasm). Water will diffuse inside the cell through osmosis. This will cause the cell to swell and eventually burst.
When you place the plant cell in the distilled water. The water will diffuse inside the cell, the water will build up inside the vacuole and turgor pressure will appear. The cell won't be able to burst because the cell wall prevents it.
What evidence do we have of Neanderthal intelligence?
Answer:
What's more, genetic evidence has shown that modern humans mated with Neanderthals before these individuals disappeared about 40,000 years ago. Many of us today still have 1 to 2 percent Neanderthal DNA, findings that suggest that modern humans who encountered these individuals saw them as people, too.
The attraction of one water molecule for another is known as
A.adhesion
B.cohesion
C.none of these
D.polarity
6. Efferent neurons sends impulses from the central nervous system to the
rest of the body. True or false
Answer: True
Explanation:
The role of afferent neurons is to send the impulses from the central nervous system (and its sensory input received) to the rest of the body.
uncontrolled cell division can lead to the formation of masses of cells that can remain in place called ____ tumors or ones that can move called ___ tumors
Answer:
Uncontrolled cell division can lead to the formation of masses of cells that can remain in a place called primary tumors or ones that can move called metastatic tumors.
Explanation:
The term primary tumor refers to the original tumor, a place where the tumor first appeared.
Metastatic tumors are tumors that appear in other organs and originate from the primary tumor. Tumor cells can break away from the primary tumor and travel to other locations in the body through the blood or lymph system and form new tumors. This is how metastatic tumors appear.
For example, a brain tumor is a primary tumor if it first appeared in the brain. A metastatic brain tumor is a tumor that appeared in another organ and then spread to the brain.
2. a) Describe the ways that energy is converted between forms during the light reactions. 2. a) Describe the ways that energy is converted between forms during the light reactions.
Answer:
Light energy is converted to chemical energy.
Please find the explanation below
Explanation:
Photosynthesis is a unique process that occurs in the cells of green plants and other autotrophic organisms. It is the process whereby they synthesize their food in form of carbohydrates (sugars). The photosynthetic process takes place in two stages namely: light dependent reaction and light-independent reactions.
The light dependent reaction or simply light reaction is the stage where light energy from the sun is harnessed by a pigment called CHLOROPHYLL and used to produce ATP needed to build glucose molecules in the next stage. Hence, via this process, the LIGHT ENERGY from the sun is converted to CHEMICAL ENERGY in ATP.
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The process of genetic engineering:
4 points
A) works to change outcomes of traits by altering genetic material.
B) is the manipulation of the genetic code in an attempt to improve a species.
C) allows scientists to create their own mutations in organisms.
D) all of the above
Steve Irwin, "The Crocodile Hunter," lived what he enjoyed doing best, getting up close and personal to some dangerous and non-dangerous animals. He was an Australian television personality, wildlife expert, and conservationist. He and his wife also ran a zoo in Australia. Irwin died after being stabbed in the chest by a stingray while filming an underwater documentary film entitled Ocean 's Deadliest.
WHAT IS THE IRONIC IN THE TEXT??
Photosynthesis takes place in the (Answer here) (organelle) of (Answer here) (type of organisms).
Answer:
photosynthesis takes place in the chloroplasts of plants
Explanation:
Photosynthesis is a process by which plants make their own food using energy from light. The materials required are Carbon (iv) oxide and water. It takes place in the chloroplasts and only occurs in plants
Why do cells divide? Select the answer that does NOT apply.
Group of answer choices
to produce new cells during an organism’s growth
to ensure that a cell does not become too large
to replace damaged cells and tissues
to ensure all cells remain undifferentiated
Answer:
To ensure all cells remain undifferentiated.
Explanation:
Cells divide to produce more, replace damages, and ensure a cell does not become to large.
So the only remaining choice is this.
True or False: A specific enzyme can be used to catalyze ANY chemical reaction.
Answer:
true
Explanation:
A particular enzyme can function over a wide range of temperature and pH. Temperature can change the activity of an enzyme.
Differential heating of the Earth's atmosphere is driven by energy from the
A.the earth's inner core
B.the sun
C.convection currents in the mantle
Answer:
B. the sun
Explanation:
the sun's ray are hot the closer they get to earth, it gets less warmer
Answer:
B
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When people fall ill, their immune system fights the disease and tries to restore the person to good health. Which disease is known to attack the human immune system leaving the body susceptible to various kinds of infection?A. Chicken PoxB. PneumoniaC. TuberculosisD. AID
Answer:
D. Aids
Explanation:
Aids is one of the most deadliest diseases in the world. When you contract aids, it's designed to infect the cells that try to destroy it, it's a whole zombie apocalypse in your body and you don't even know it.
It attacks and weakens the immune system, and our immune system defends our bodies against infections, but HIV is extremely strong and it over powers the system, I'm not sure if there's an immune system strong enough to fight HIV or aids.
How does the cooling rate of magma affect the
texture of igneous rock?
Answer:
The factor that affects the size of the crystals and the texture of the rock is the cooling rate of the molten rock or magma. If the magma cools rapidly, the crystal formed is very small. ... On the other hand, if the magma cools slowly, the crystal formed is large. This rock has a coarse-grained texture.
Explanation:
The texture of an igneous rock is completely dependent on the rate of cooling of the melt. Slow cooling allows large crystals to form whereas fast cooling gives small crystals.
How is cooling rate of magma related to texture of igneous rock?If the magma cools quickly then the reactions are much more faster and smaller mineral crystals. Igneous rocks have a distinctive appearance based on the rate of cooling.
Cooling rate of the molten rock or magma is the factor that mainly affects the size of the crystals and texture of the rock. Crystal formed is very small, when the magma cools rapidly whereas, the crystal formed is large, if the magma cools slowly.
Rocks formed from the crystallization of a liquid are called Igneous rocks. Igneous rocks are divided into:
Intrusive rocks that crystallize from magma in the earth's crust. Extrusive rocks that crystallize from lava in the earth's crust.To know more about igneous rock, refer
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In corn, seeds may be starchy (S) or sweet (s). Cross two heterozygous starchy corn plants. Using a Punnett’s square, give the phenotypic ratio then state the proportion of offspring that would be expected to be sweet?
if we cross Ss with Ss on the punnet square we will get the gametes S and s for both parents
on top left we have SS since we combine the alleles S and S
on top right we have Ss since we combine the alleles S and s
on bottom left we have Ss since we combine the alleles S and s
on bottom right we have ss since we combine the alleles s and s
The phenotypic ratio starchy:sweet is 3:1
1:3 of the offspring will be sweet
Why did the researchers NOT tell the patients which pill they were given?
Answer:
where is the rest of the question
Explanation:
Is this right? Help ASAP
Answer:
its actually is 51% good luck
In the desert food web above which of the following species would have the largest negative
impact if it was removed?
A. golden eagle
B. black-tailed prairie dog
C. sand sagebrush
D. kit fox
Answer:black tailed prairie dog
Explanation:
Because that is the center of attention everyone in the food corcle wants it
Does the fossil of Archaeopteryx support Darwin's idea? Explain your answer.
(look at picture and read)
Answer:
yes
Explanation:
An analysis of fossil traits indicates that Archaeopteryx is not a bird at all. ... Archaeopteryx seemed to confirm Darwin's theories and has since become a key piece of evidence for the origin of birds, the transitional fossils debate, and confirmation of evolution.