Petrifaction means turning to

mud.

dust.

stone.

mold.
1 points

QUESTION 2

______ developed the concept of half-life.

Ernest Rutherford

Leonardo da Vinci

James Hutton

none of the above
1 points

QUESTION 3

Which of the following is an isotope pair used to determine the age of rocks?

uranium-lead

rubidium-strontium

potassium-argon

all of the above
1 points

QUESTION 4

What do periods make up?

epochs

eras

eons

none of the above
1 points

QUESTION 5

Which of the following is an eon in the time scale?

Phanerozoic

Proterozoic

Archean

all of the above
1 points

QUESTION 6

Which of the following happened during the Precambrian Era?

the first prokaryotic cells

the first eukaryotic cells

development of photosynthesis

all of the above
1 points

QUESTION 7

Which of the following is the earliest era of Earth's geologic time scale?

Cenozoic

Mesozoic

Precambrian

Paleozoic
1 points

QUESTION 8

A.I. Oparin hypothesized that cellular life was preceded by a period of

volcanic eruptions.

chemical evolution.

extinction.

none of the above
1 points

QUESTION 9

_____ systems have a membrane that separates the internal chemicals from the external chemical environment.

Living

Chemical

both a and b

none of the above
1 points

QUESTION 10

During which period did the presence of stromatolites decline?

Cambrian

Proterozoic

Jurrasic

Cretaceous
1 points

QUESTION 11

What did all known Proterozoic animal fossils not have?

shells

DNA

both a and b

none of the above
1 points

QUESTION 12

______ do not have a nucleus and membrane-bound organelles.

Prokaryotes

Eukaryotes

both a and b

none of the above
1 points

QUESTION 13

Which of the following is a main type of vertebrate?

reptile

fish

mammals

all of the above
1 points

QUESTION 14

Which of the following is a period in the Paleozoic Era?

Devonian

Cambrian

Permian

all of the above
1 points

QUESTION 15

The first ______ evolved during the Ordovician period.

mammals

fish

reptiles

none of the above