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oksian1 [2.3K]
3 years ago
12

What was the time frame?

Biology
1 answer:
Andrew [12]3 years ago
3 0

Answer:

4.6 to 4 Billion Years Ago

Explanation:

According to the researchs and studies, the earth formed about 4.54 billion years ago and the oldest known living organism date to around 3-3.5 billion years ago which are the first bacteria that formed in the water.

I hope this answer helps.

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Phytoplankton are so tiny you need a microscope to see them. How do they affect the global carbon cycle?
Ksju [112]

Answer:

Phytoplanktons are microscopic creatures that are primary producers of oceans. Phytoplanktons take carbon dioxide from atmosphere to make their food and then they are eaten by some other animals of oceans.

Phytoplanktons are present in huge numbers in oceans and have a great contribution to the carbon cycle because it is responsible for the transfer of carbon dioxide from the atmosphere to the oceans.  

Most of the carbon is released through combustion by animals that eat phytoplanktons but some accumulate in the ocean floor because some dead phytoplanktons settles down in the ocean.

6 0
2 years ago
Which of the following organisms exhibits cephalization?
bezimeni [28]
Cephalization describes the process by which organisms develop a distinct head. The head of a cephalized organism contains a concentrated group of nerves, or brain, that controls the rest of the organism, as well as specialized organs for consumption and perception, like mouths, eyes and ears. Cephalized organisms exhibit a distinct division between parts of the body; they have a front, back, top and bottom. These animals comprise the bulk of animals that are encountered on a daily basis.

sea star following organisms exhibits cephalization
4 0
3 years ago
In a hypothetical population of plants, flower color is determined by a single gene with two alleles. In a population of 500 pla
Dvinal [7]

Answer:

Phenotype genotype Number of individuals

Red RR 245

Pink Rr 210

White rr 45

Number of alleles in total

R = 245 + 245 + 210 = 700 ---> 700/1000= 0.7 R frequency

r = 210 + 45 + 45 = 300 -----> 300/1000 = 0.3 r frequency

Predict (Hardy Weinberg) genotype frequencies=

p^2 + 2pq + q^2 = 1

p= 0.7

q=0.3

0.49 + 0.42 + 0.9 =1

According Punnett Squares in F1 we have=

Rr* rr = Rr 50% and rr 50%

4 0
3 years ago
Which is a characteristic of cancer cells
rjkz [21]

Answer:

<h2>A.controlled cell division </h2>

Explanation:

Thankyou

8 0
2 years ago
What makes different types of blood different?
sweet-ann [11.9K]
The antigens that are on the blood A antigens, B antigens and the Rh if it is a positive or negative
3 0
3 years ago
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