mauricioperez0902

19.08.2019 • 

Chemistry

According to scientific evidence, earth’s earliest atmosphere lacked oxygen. over time, oxygen was added to the atmosphere.
which statements explain how this change occurred and how it affected life on earth?
choose all answers that are correct.
a.
the addition of oxygen to the earth's atmosphere make possible the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.
b.
when cyanobacteria evolved, they carried out photosynthesis. oxygen is a product of photosynthesis. the addition of oxygen to earth’s atmosphere make possible the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.
c.
the addition of oxygen to the earth's atmosphere make possible the development of prokaryotic organisms, which need oxygen to carry out many of their life processes.
d.
when cyanobacteria evolved, they carried out photosynthesis. oxygen is needed to carry out photosynthesis.

Ответ:

KozzyKoz

30.12.2021

Chemistry

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B.
The cynobacteria were already there without the oxygen, so that rules out A, and a lot of prokaryotes were anaerobic, so that rules out C. Finally, Photosynthesis does not require oxygen. Instead, Oxygen is a waste product of it. Therefore, it cannot be D. So, we are only left with B
Hoped this helped :D

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Ответ:

cupkakekawaii45

07.06.2022

Chemistry

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The formula for specific gravity is:

where is the density of the substance and is the density of water.

The density of water, =

Substituting the values in above formula we get,

The formula of density is:

The density of mercury is

The mass of mercury is

Substituting the values in density formula:

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