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Eddi Din [679]
3 years ago
10

PLZZZZZ HURRY!!!!!Scientists estimate that the Earth formed some 4.6 billion years ago with the first forms of life appearing ar

ound 3.5 billion years ago. These first forms of life were simple prokaryotes. Later, the first photosynthetic organisms resulted in more _____________ in the atmosphere. This allowed for more higher level organisms to appear on Earth.
A) carbon
B) nitrogen
C) oxygen
D) sulfur
Biology
1 answer:
FinnZ [79.3K]3 years ago
3 0
I have no idea, i speak english how about u

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Illusion [34]

Answer:

It would be A: a cell that has double the number of chromosomes as the parent cell

and if for some reason that is wrong then it could possibly be C and just use the same explanation.

Explanation:

This is because Haploid Gametes are the things that are produced during meiosis-which is a type of cell division which reduces the number of chromosomes in a parent diploid cell by half

7 0
3 years ago
Vertical ocean circulation is generated by
icang [17]

Answer:

B. maybe I dont know but can you help me with dna

5 0
3 years ago
Mendel bred an unknown plant displaying a dominant phenotype with an individual showing the recessive phenotype; then, he analyz
kodGreya [7K]

What Mendel did according to the illustration would be called test-crossing.

<h3>Test-crossing</h3>

In genetics, test crossing is a procedure through which the zygosity of an individual can be determined - whether it is homzygous or heterozygous.

Test crossing requires that an organism who displays a dominant trait but whose zygosity is unknown is crossed with another organism of the same species but who displays the recessive version of the same trait.

By so doing and using the knowledge of probability, the resulting offspring from the cross will be used to determine the zygosity level of the parent.

More on test crossing can be found here: brainly.com/question/16805498

5 0
2 years ago
What name is given to the rigid structure, found outside the plasma membrane, that surrounds and supports the bacterial cell?
Elodia [21]

3. cell wall

The cell wall is a rigid supporting structure.

7 0
3 years ago
1<br> Which characteristic do all living organisms show?
katen-ka-za [31]

Answer:

All living organisms share several key characteristics: order, sensitivity/ response to their environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.

Explanation:

Hope this is helpful!

7 0
2 years ago
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