Question

Which was the earliest multicellular organism that developed in the presence of oxygen?

A.
eukaryotic

B.
prokaryotic

C.
cyanobacteria

D.
algae

Answer 1

algea

Answer 2

thanx for the medal

Answer 3

Certain types of atoms break down at a known rate. Scientists can measure the amounts of the broken down products present in a sample to calculate its age.

What is this technique called?

A.
the fossil record

B.
radiometric dating

C.
speciation

D.
natural selection

Answer 4

@Phebe

Answer 5

im here

Answer 6

kk the question above plz

Answer 7

ok

Answer 8

B

Answer 9

When scientists examine the fossil record, they find the remains of different species in layers of rock of different ages.

What do they deduce from this?

A.
life on earth has remained constant and unchanging

B.
fossils sink at different rates

C.
the earth experienced many floods in the distant past

D.
life on earth has changed over time

Answer 10

@Phebe

Answer 11

D

Answer 12

byee

Answer 13

Srry but i got 2 more

Answer 14

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

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

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

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 15

@Phebe

Answer 16

B. and D.

Answer 17

The correct answers are - B and D.