NAIMMCQ Concepts of Science There is a lack of fossils up to the time of the _________ because organisms did not produce hard calcium shells before that period.

There is a lack of fossils up to the time of the _________ because organisms did not produce hard calcium shells before that period.

Concepts of Science

There is a lack of fossils up to the time of the _________ because organisms did not produce hard calcium shells before that period.

a) Cambrian explosion
b) appearance of flowering plants
c) extinction of the dinosaurs
d) largest known mass extinction
e) none of the above

Answer: A

NAIMMCQ

There is a lack of fossils up to the time of the _________ because organisms did not produce hard calcium shells before that period.

There is a lack of fossils up to the time of the _________ because organisms did not produce hard calcium shells before that period.

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