Which properties of minerals is not as reliable because it can change from mineral to mineral? streak color crystal structure density

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.

Which of the following is evidence to the past existence of glaciers?

Solve for r in the formula v = ir, when i = 5 and v = 15.