The most complex level of organizational hierarchy in the arctic national wildlife refuge that is preserved is
a. the population of brown bears in the area.
b. every species of fish in the area.
c. every ecosystem in the area.
d. the biosphere that includes alaskan life.

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.

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

All of the following occurred due to the invention of the railroad except