What does history like Egypt history or Mayan Mexico history teach us about the future of humans? Don’t put a big sentence put a short sentence don’t copy

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.

Does anyone know the answers for these

How much water is in the ocean in cubic kilometers