What causes a shield volcano to be shaped like a broad dome?

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.

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

What could the united states of america do to improve their status? name at least 3(ap human geography)