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.
Oxygen is needed to carry out photosynthesis. When cyanobacteria evolved, they began to carry out photosynthesis.

B.
Oxygen is a product of photosynthesis. When cyanobacteria evolved, they began to carry out photosynthesis.

Answer 1

C.
Adding oxygen to earth's atmosphere allowed for the development of prokaryotic organisms, which need oxygen to carry out many of their life processes.

D.
Adding oxygen to earth's atmosphere allowed for the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.

Answer 2

i think b

Answer 3

but i do not now what else

Answer 4

I'm not very great at this, but I guess B

Answer 5

but it says Choose all answers that are correct.

Answer 6

hold on

Answer 7

ok

Answer 8

I'm trying to read up on it so I can help you. Are you in K12?

Answer 9

yes

Answer 10

What grade?

Answer 11

7th

Answer 12

Cool, i'm in 6th grade. I also am in K12 :D

Answer 13

cool

Answer 14

either way, C looks like one too

Answer 15

ok thanks

Answer 16

I hope that's right! If not, go over the test and write down the answer and take it again, I do that sometimes

Answer 17

well on my tests they always chang the q

Answer 18

Ugh, I hate when they do that

Answer 19

me too lol

Answer 20

Do you have Instagram?

Answer 21

i passed i got an 84% WHOO

Answer 22

Yay!!

Answer 23

no you

Answer 24

yea

Answer 25

i have google though

Answer 26

Are you a boy or girl?

Answer 27

girl

Answer 28

cool, me too

Answer 29

nice

Answer 30

That's a cute cat, lol

Answer 31

thanks i drew it then i had to scan it to my computer

Answer 32

wow, it's really good!!

Answer 33

thanks

Answer 34

yw

Answer 35

well i got to get back to school work

Answer 36

so bye

Answer 37

bye :)