How are earth and Venus similar? A. They are similar in size and direction of revolution around the sun.
B. They are similar in color and shape.
C. They are similar size in rotation direction.

Why are fossils of organism's from the phanerozoic eon much more likely to be found than fossils of organisms from any other eon? a. more organisms present during the phanerozoic eon had soft body parts. b. organisms present during the phanerozoic eon were all microscopic. c. more organisms present during the phanerozoic eon had hard body parts. d. organisms present during the phanerozoic eon are the most ancient life forms.

Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic