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Misha Larkins [42]
3 years ago
9

Question 2 of 10 of the day!

Biology
2 answers:
e-lub [12.9K]3 years ago
7 0
<span>Most of the nitrogen gas in Earth's atmosphere comes from _____.

</span>
<span> D. the breakdown of carbon dioxide</span>
storchak [24]3 years ago
5 0

The majority of nitrogen in Earth's atmosphere comes from B. erosion.

I did my research.

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frutty [35]

here ya go bud https://youtu.be/dQw4w9WgXcQ

7 0
3 years ago
Read 2 more answers
Which of the following is the correct way to include the title of a magazine article in a bibliographic entry? “Basketball’s Sur
BabaBlast [244]
That doesn’t rlly make much sense... you’d joyful search up the answer instead or HMU
4 0
2 years ago
Read 2 more answers
What are three types of barriers that can lead to reproductive isolation
maw [93]
Temporal isolation , behavioral isolation, and geographical isolation I hope I answered your question if not please try searching up or using further sources
4 0
3 years ago
If a pea plant has a genotype SSTt what are the possible genetic combinations that could be present ina single grain of pollen p
Evgesh-ka [11]
Correct answer: D

A pollen is where male gametes are produced and so the number of chromosomes, as we are talking about gametes, is n. This means that the grain of pollen will only have a copy of each gene, and therefore only one allele for each gene - one S, and one T or t. So, the possible combinations are ST and St. 
3 0
3 years ago
Which one of the following is a major difference between the circulatory systems of earthworms and fish?
labwork [276]
<span>a. Fish have a single central heart; earthworms have several hearts.

</span>
Multi cellular organisms are made up of billions of cells each specialized to a unique role and these cells are organized into structural and functional units such as tissues and organs.
For each cell and organ to function optimally, it requires oxygen and nutrients and needs carbon dioxide and  metabolic waste taken away  in a  continuous, never ending  process.
<span>A mechanism  is needed to accomplish the important function of transporting the relevant materials to and from the cell. The circulatory system fits this  bill splendidly. It is a specialized organ system which allows blood  and lymph to flow through the entire body carrying nutrients such as glucose, amino acids and electrolytes as well as oxygen to each cell, at the same time carting away carbon dioxide and all sorts of metabolic waste over to excretory organs  to be expelled from the body.
</span>
6 0
3 years ago
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