Figure 21-1
Use the figure to answer the corresponding question(s) . 
-The theory illustrated by Figure 21-1 is used to explain the origin of:
A) anaerobes.
B) prokaryotes.
C) eukaryotes.
D) vascular plants.
E) protobionts.
Correct Answer:
Verified
Q50: The time in the history of Earth
Q51: The first fish:
A) were small and jawless
Q52: Not much physical evidence of life is
Q53: Mammal-like reptiles arose during the:
A) Carboniferous period.
B)
Q54: Figure 21-1
Use the figure to answer the
Q56: Reptiles dominated the:
A) Proterozoic era.
B) Paleozoic era.
C)
Q57: Vascular plants and air-breathing animals first appeared
Q58: Amphibians evolved directly from what ancestral organisms?
A)
Q59: Figure 21-2
Use the figure to answer the
Q60: Shallow seas covered much of the land
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