Earth Science Geology, the Environment, and the Universe

Section 4: Early Life on Earth

Self-Check Quizzes-English

1
What type of life-forms existed before the Proterozoic?
A)prokaryotes
B)eukaryotes
C)algae
D)fungi
2
What did organisms of Earth's first 4 billion years have in common?
A)They were single-celled organisms.
B)They were multi-celled organisms.
C)They breathed oxygen.
D)They were photosynthetic.
3
One thing is essential to all forms of life on Earth. What is it?
A)oxygen
B)soil
C)water
D)sunlight
4
According to the figure, in which era or eon did life first evolve?
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A)Archean
B)Paleozoic
C)Proterozoic
D)Mesozoic
5
__________ are the building blocks of proteins.
A)DNA and RNA
B)Amino acids
C)Formaldehyde molecules
D)Cyanide molecules
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