Question

MEDALS

Answer 1

What do scientists estimate is the approximate age of the planet earth?

A.
660 million years

B.
3.5 billion years

C.
4.6 billion years

D.
12.2 billion years

Answer 2

@Destinymasha

Answer 3

please help me with a lot of questions Destiny please

Answer 4

Also fan me so i can message u

Answer 5

C?

Answer 6

If I remember correctly, I believe 4.6 Billion years :)
and Okies :P

Answer 7

thanks I will get another up

Answer 8

c.

Answer 9

DEF. c

Answer 10

Which cells contain a nucleus and membrane-bound organelles?

A.
prokaryotic

B.
eukaryotic

C.
archaean

D.
cyanobacteria

Answer 11

Oh, the organism that do not have a membrane bound nucleus, are called Prokaryotes :)

Answer 12

AA thanks

Answer 13

Before there was any life on earth, which gas was absent from earth’s ancient atmosphere?

A.
nitrogen

B.
ammonia

C.
oxygen

D.
methane

Answer 14

Before there was life -->which one do we need to live?

Answer 15

Or to breathe rahter?

Answer 16

Eukaryotic cells
Eukaryote.

A cell that contains a nucleus and membrane bound organelles

Answer 17

B?

Answer 18

C sorry

Answer 19

Yuppers :P
and the other, i got confused >.< 'tis actually Eukaryotes, :) I thought it said ''does not contain'' , so I said Prokaryotes lol

Answer 20

c) oxygen

A simple reason that oxygen is the dire need for orgainsms to survive on earth.

Answer 21

IS C correct?

Answer 22

Yesh :)

Answer 23

You can't live if you can't breathe :)

Answer 24

here,Which process do scientists think provided earth with an oxygen-rich atmosphere?

A.
spontaneous generation

B.
radiometric dating

C.
photosynthesis

D.
respiration

Answer 25

after this I have one more

Answer 26

c) photosynthesis

Answer 27

C correct?

Answer 28

Photosynthesis? Yesh :)

Answer 29

What organism has been found in the oldest fossils?

A.
fish

B.
ferns

C.
humans

D.
cyanobacteria

Answer 30

d

Answer 31

I believe so :3

Answer 32

thanks I have to go thought

Answer 33

I will be on tomorrow

Answer 34

Alrighty, Jenna :) See ya later :3

Answer 35

Cyanobacteria or blue-green algae became the first microbes to produce oxygen by photosynthesis, perhaps as long ago as 3.5 billion years ago and certainly by 2.7 billion years ago. But, mysteriously, there was a long lag time - hundreds of millions of years - before Earth's atmosphere first gained significant amounts oxygen, some 2.4 billion to 2.3 billion years ago.

Answer 36

The oldest known fossils, in fact, are cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old.

Answer 37

LOL 1. Was B 100% if you put 1. As B