How will cities need to change to accomodate growth

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.

These are the abiotic factor or biotic factors that restricts the numbers, reproduction, or distribution of organisms.

After world war i, how did the us economy compare to that of germany?