Study the timeline. A timeline. 4.5 billion years ago, Earth is formed. 4.3 billion years ago, Earliest water. 4.1 billion years ago, Single celled life. 3.5 billion years ago, Earliest oxygen and photosynthesis. 2.5 billion years ago, Complex single celled life. 1.5 billion years ago, Multi cellular life. 500 million years ago, Land life. 300 million years ago, Dinosaurs. 200 million years ago, Mammals. 130 million years ago, Flowers. 5 million years ago, Humans. Based on fossil evidence, about how long ago did the first single-celled life form appear on Earth? 130 million years ago 1.5 billion years ago 2.5 billion years ago 4.1 billion years ago

Answers

Answer 1

Answer:

B sry if im wrong

Explanation:

Answer 2

Answer: D: As the leaf decomposes, carbon from the leaf is left on the rock

Explanation:

Got it right!


Related Questions

4a. By 40-60 years after farm fields had been abandoned, the amount of herbaceous plants

decreased. Give one reason why the amount of herbaceous plants decreased as the amount of trees

increased.

Answers

Answer:

See the answer below

Explanation:

The amount of herbaceous plants in an abandoned farm field will keep decreasing with time and the amount of trees would be increasing instead due to successional forces.

Succession refers to the gradual change in the species structure of a community with time. Early successional species usually colonize new habitats and with time, they are replaced with late successional species until a relatively stable community, climax community, is established.

Herbaceous species on abandoned farmland represent early successional species and as time goes on, they will be replaced by mid to late successional species in the form of shrubs and trees until a relatively stable community is formed. Hence, herbs would be decreasing while trees would be increasing.

Read each of the sentences that describe the results of the Hershey-Chase experiment. Drag each statement to the correct bacteriophage experiment. Bacteriophages are shown marked with either phosphorus-32 or sulfur-35. Bacteriophage contains radioactive isotope that is used to mark protein. Bacteriophage contains radioactive isotope that is used to mark DNA. Radioactivity is found inside the infected bacterium. No radioactivity is found inside the infected bacterium. Results confirm that DNA is the genetic material of the bacteriophage. Results confirm that protein is not the genetic material of the bacteriophage. Bacteriophage marked with phosphorus-32 Bacteriophage marked with sulfur-35

Answers

Answer:

phosphorus-32:

Bacteriophage contains radioactive isotope that is used to mark DNA.

Radioactivity is found inside the infected bacterium

Results confirm that DNA is the genetic material of the bacteriophage.

sulfur-35:

Bacteriophage contains radioactive isotope that is used to mark protein.

No radioactivity is found inside the infected bacterium.

Results confirm that protein is not the genetic material of the bacteriophage.

Explanation:

Believe me I just did the test and I got it right.

Hope I got to help :))

The sentences that describe the results of the Hershey-Chase experiment is :

1) Phosphorus-32:

Bacteriophage contains radioactive isotope that is used to mark DNA.Radioactivity is found inside the infected bacteriumResults confirm that DNA is the genetic material of the bacteriophage.

2) Sulfur-35:

Bacteriophage contains radioactive isotope that is used to mark protein.No radioactivity is found inside the infected bacterium.Results confirm that protein is not the genetic material of the bacteriophage.

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PLEASE HELP!! I NEED THIS ANSWERED FAST PLEASE!!!
In humans, the form of cell division
in which the number of
chromosomes is halved to produce
gametes is known as -
a) mitosis
b) centrioles
c) meiosis
d) cytokines

Answers

the answer to this question is c meiosis

Answer: C. Meiosis

Explanation: "In humans, n = 23. Gametes contain half the chromosomes contained in normal diploid cells of the body, which are also known as somatic cells."

The top sequence is A G C T G T.
The bottom sequence is A G C T G A T. A G C T G A T.

- insertion
- deletion
- substitution

Answers

Answer:

substitution

Explanation:

Answer:✔ insertion

Explanation:

which one of the following best describes the functions of carbohydrates with living things?

a) enzymatic processes (speed up chemical reactions)

b) quick energy, energy storage, and structural components like cellulose cell walls and chitin exoskeletons

c) hereditary information (transmission of genes)

d) storage of energy, insulation, waterproof coverings, cell membranes and hormones

Answers


It’s between b and d. I would go with b based on the information below.

The four primary functions of carbohydrates in the body are to provide energy, store energy, build macromolecules, and spare protein and fat for other uses. Simple carbohydrates are quick energy sources, but they do not usually supply any other nutrients or fiber. One of the most important functions of carbohydrates is to form a structure called the glycocalyx. This is a coat around the cell.

How did human activity causes the disappearance

Answers

Due to the rise of Pollution, Global Warming, and Overfishing, it causes the Kelp forests to lessen in population. With pollution, it gets in the water, and causes the kelp to die out. With Global warming, the water gets warmer, causing the kelp to die out as well. And with overfishing, they catch fish that eat other fish that eat the kelp.

Help me with this question. plzzzzz​

Answers

Answer:

d. Protection

Answer:

transpiration is of the function of epidermal cells of a leaf

Substances that absorb light convert it to heat or _____ energy.

Answers

Answer: kinetic energy

Explanation:

Which of the following represents the codon sequence that
corresponds to the segment of DNA below?
TATCAGGAT

Answers

Answer:

ATAGTCCTA

Explanation:

a and t pair together and c and g so it would be ATAGTCCTA i think

PLS help me ill give you brainliest!!!!
Which statement would be used in an argument against the use of human embryonic stem cells for therapy?

A.Obtaining embryonic stem cells for use in therapy requires the destruction of embryos.

B.Embryonic stem cells are limited in their ability to become different types of cells.

C.It is difficult to grow embryonic stem cells in laboratory cultures, so they are not a practical choice for stem cell therapy.

D.Embryonic stem cells originate in plants, so the likelihood of rejection by a patient’s body is high.

Answers

Answer:

A. Obtaining embryonic stem cells for use in therapy requires the destruction of embryos.

Explanation:

The graph below shows the effect of carbon dioxide levels on the rate of photosynthesis.
Rate of Photosynthesis
r
Carbon dioxide level
If the amount of carbon dioxide available to the plant approaches zero, what will happen to the plant's rate of photosynthesis?
OA. It will decrease.
ОВ. .
It will not change.
OC.
It will increase, then decrease.
OD. It will increase.
Reset
Submit
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Answers

The rate of photosynthesis will decrease.

How does the United States GDP compare with that of the rest of the world?

Answers

Answer:

Is this what you're looking for?

Explanation:

In 2018, the United States accounted for 15.2 percent of global gross domestic product (GDP) after adjusting for purchasing power parity (PPP). This share was expected to decrease to 13.86 percent by 2024, which is roughly a seventh of the global total.

What adaptations do humans have ??

Answers

Answer:

Endurance running

Sweating

Walking upright

Hearing tuned for speech

Great teeth

What is the best answer for volume of a cube whose sides measure 5 inches each?

Answers

Answer:

is 125

Explanation:

divisions are made to get the result.

Answer:

125 inches I think

Explanation:

length times width times breadth I think I hope this helps

why is DNA referred to as the genetic code?

Answers

The genetic code is the set of rules by which information encoded in genetic material (DNA or RNA sequences) is translated into proteins (amino acid sequences) by living cells. Those genes that code for proteins are composed of tri-nucleotide units called codons, each coding for a single amino acid.

What are the names of the monomers that make up DNA?

Answers

Answer:

the monomer units of DNA are nucleotides in the polymer is known as a polynucleotide each nucleotide consists of a 5-carbon sugar a nitrogen-containing base attached to the sugar and a phosphate group

A negatively charged ion has what

Answers

Answer:

The negative charge of an ion is equal and opposite to charged proton(s) considered positive by convention. The net charge of an ion is non-zero due to its total number of electrons being unequal to its total number of protons.

Explanation:

Answer:

More Eletrons than Protons

Explanation:

If the charge is neutral there are the same amout of protons and eletrons, but when it is negative, it means that there are more eletrons (because eletrons have negative charge by nature)

The cell membrane controls what enters and exits the cell to maintain what?

Answers

Homeostasis

Explain:

Answer:

A selectively permeable membrane will allow water to flow freely while limiting the passage of molecules, especially large molecules or those with a charge.

Explanation:

Do all cells have every organelle?

Answers

Answer:

No.

Explanation:

Some organelles are found only in some cell types.

No all cells dont  have ALL organelles

Explanation:

The chloroplasts mitochondria and etc. all make up the cell which are all organelles but the plant cell and animal cells are made up of different organelles

What does B, A, and C represent?

Answers

Answer:

A: Nucleus

B: Mitochondrion

C: Cell Wall

PLZZ HELPP THIS IS OVERDUE!
Explain how the sun's heat drives the circulation of water between the land, oceans, and atmosphere.

Answers

Answer:

The water cycle.

Explanation:

The sun drives the movement of water through a process called the water cycle. In this process, water is evaporated from the sun's heat that reaches Earth. This water rises into the atmosphere in the for of water vapor. This water vapor then collects in the atmosphere along with other particles such as fine dust. This water then precipitates back onto the Earth. Presumably, the water precipitation may fall onto a land formation and integrate back into the ecosystem in the form of ground water or join a steam/river and end up in a lake or the ocean. The water then continues this cycle.

Assume that brown eyes, B, are dominant to blue eyes, b. If a blue eyed person marries a person with brown eyes, what genotype must they both be to ensure that all of their children will have brown eyes? Make a Punnett Square showing they two of them.

Answers

Answer:

Brown = BB

Blue = bb

There children will have Brown eyes : Bb

Which of the following is not an example of energy transformations in an ecosystem?
A) sunlight driving photosynthesis in plants
B) herbivores feeding on plants
C) predators feeding on herbivores
D) burning of fossil fuels
E herbivores feeding on carnivores
I

Answers

The answer is D burning of fossil fuels

Answer:

d

Explanation:

burning of fossil fuels

What is ATP, and how is energy released from the molecule of ATP? Please be specific of which parts of the molecule release the energy.

Answers

Answer:

Molecular Structure of ATP. Energy is released by hydrolysis of the third phosphate group. After this third phosphate group is released, the resulting ADP can absorb energy and regain the group, thus regenerating an ATP molecule; this allows ATP to store energy like a rechargeable battery.

Explanation:

Label A, B, C, and D in the image below. What theory is this? Explain your answer using the image provided.

Answers

Answer:

I think is C

Explanation:

In the Krebs cycle, how is citric acid formed? (1 point)
O Enzymes combine hydrogen ions, oxygen, and electrons.
O Carbon dioxide bonds with a chain of coenzyme A.
O Pyruvic acid molecules are broken down by an acetyl group.
O Acetyl-CoA joins with a large molecule called oxaloacetic acid.

Answers

Answer:

D. Acetyl-CoA joins with a large molecule called oxaloacetic acid.

Explanation:

this forms a citrate molecule, which is then oxidized and releases two carbon dioxide molecules to be fed into the cycle.

Answer:

For connexus students: Cell Work Unit Test

Explanation:

1. 12

2. Chlorophyll breaks down because there's less sunlight.

3. The Calvin-Cycle is light independent (does not need sunlight)

4. light

5. C6 H12 O6 + 6O2 + 6H2O + energy

6. Pyruvic Acid+ NADH --> Lactic Acid+ NAD+

7. Acetyl-CoA joins with a large molecule called oxaloacetic acid

8.Electrolosis

9. ATP

10. Krebs Cycle

11. Oxygen

12. 12

13. Ectotherms cannot insulate- and can only control their body temperature by choice.

14. Shivering

Which of the following is a characteristic of putrefaction?
Skin tightening
Muscle relaxation
Bloating
A blue discoloration

Answers

Answer:

C. Bloating

Explanation:

Got it right on Edge 2020

Answer:

Bloating

Explanation:

GP

A farmer applies different fertilizer to his cotton crops, to see which will make his plants grow the highest. What is the dependent variable?

A. Type of Fertilizer
B. Height of Plants
C. Weight of Plants
D. Different Cotton Crops​

Answers

A because he changes the fertilizers

Variables are the measurable quantities in an experiment that can have different values

In the given farmer's experiment, the dependent variable is option B.

B. Height of Plants

The reason the above selection is correct is as follows:

The dependent variable and the independent variable are two types of

variables in a study that seeks to identify cause-and-effect relationships

[tex]\begin{array}{|c|cc|}Cause, x \ (independent \ variable)&&Effect, y=x^2 \ (Dependent \ variable)\\0&&0\\1&&1\\2&&4\\3&&9\\4&&16\\5&&25\end{array}[/tex]

An example using fertilizer and crop height is presented as follows;

[tex]\begin{array}{|c|cc|}Fertilizer \ Cause &&Crop \ Height \ (cm) \ Effect\ (Dependent \ variable)\\Type \ 1&&23\\Type \ 2&&25\\Type \ 3&&24\\Type \ 4&&30\\Type \ 5&&45\\Type \ 6&&25\end{array}[/tex]

The cause of the observed effect is the independent variable (x) which is

not dependent on the other experimental variables.

The effect which is being observed or measured is the dependent variable

(y).

The farmer intends to see the growth in height of his plants due to the

application of different fertilizers

Therefore;

The effect (of the fertilizer) being observed or measured by the farmer is the height of the plant, which is then the dependent variable

The correct option for the dependent variable is option B. Height of Plants

Learn more about dependent variables here:

https://brainly.com/question/17071524

Help pleaseeeee!!!!!!!!

Answers

Answer:

A gas.

Explanation:

Gas is highly flammable wand spreads rapidly  if you pour a lot.

Please please help- 15 pts- PLEASE GET IT CORRECT

Answers

Answer:

I had this question before but I don't remember what is was but it's most likely c in this photo

Other Questions
This is the name of the group that challenged the court decision in Boynton v. Virginia.* O Freedom Riders O Freedom Fighters O Free RidersO Free Fighters Multiple choice! Pls help :) i really need help! Multiply 1 by 5 152 x 61 = You react 14.5 grams of sodium hydroxide with 14.5 grams of copper II sulfate. At the end of the lab you find that you recovered 7.99 grams of precipitate. When you write the balanced equation for you reaction, what is the coefficient in front of sodium hydroxide? Which of the following coordinate points have an x-value of 4? Select all that apply.A) (2, 4)B) (4, 5)C) (4,0)D) (4,3) Solve for x.TXcoS1610RV^ (ignore all the letters) 1011001 in decimal please hurry up Select all equations that have one solution. 3( x 2) = 3( x 2) 1/2( x) = x + 1/2 3/4(4 x 8) = 18 2 x + 2 x + 2 = 4 x + 2 x + x ( x + x) = 2 x x + 2 will name brainiest please help thank u Marriage is a social institution where a man and woman lives as husband and wife. Elaborate with justification. Besides being classified by their composition, how else are rocks classified?a.by their texturec.by their colorb.by their massd.by their volume The economic effect of an expense is incurred when the benefit expires or is used up not when cash is paid true or false which relations represent functions? Which of the following social classes would have supported the Mexican Movement for Independence? Helpppp.What can you infer about Shakespeares view of the English treatment of the inhabitants of the new world from his contrast anyone please help!!! what do punnet squares do What does thewinter solstice inthe northernhemisphere ofthe United Statesrepresent?A. the day with the least sunlight of the yearB. the lunar eclipse of the yearC. the month with the least days in the year a water spinkler sends water out in a circular pattern how large is the watered area if the watering pattern is 12 ft will mark brainliest :-)Click on the 3 pairs of lines from the poem that deal with the early death of the athlete.1 THE time you won your town the raceWe chaired you through the market-place2 Smart lad, to slip betimes awayFrom fields where glory does not stay3 Eyes the shady night has shutCannot see the record cut4 And silence sounds no worse than cheersAfter earth has stopped the ears5 Runners whom renown outranAnd the name died before the man