Question

.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 helped make possible the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.

Answer 1

B.
When cyanobacteria evolved, they carried out photosynthesis. Oxygen is a product of photosynthesis. The addition of oxygen to earth’s atmosphere helped 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 helped 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.

Answer 2

this can be more than one answer @Destinymasha

Answer 3

It's NOT C
Because Pro's didn't need Oxygen~

Answer 4

ok. uhhh i think B might be one of them

Answer 5

Yes, yes, B looks like one of them ^.^

Answer 6

A looks like one too

Answer 7

i'm not sure about D

Answer 8

I actually think it's just B

Answer 9

it says choose all staments that look correct

Answer 10

Yea, but......I'm only super convinced about B
But I guess you could choose whichever ones you feel safe with

Answer 11

Ahh i don't know

Answer 12

>,< Sorry

Answer 13

its fine