Which natural resources did early humans need for basic survival? A. Early humans needed tools made from rocks.
B. Early humans needed material to make boats with sails to get from place to place.
C. Early humans needed water, plants and animals for food.
D. Early humans needed fresh water and clean air.

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

What kind of crystalline solid is graphite? o a. molecular solid b. metallic solid o c. network solid d. ionic solid

Select three sports that require participants to be highly fit before the beginning a: snowboarding b: skydiving c: rock climbing d: bungee jumping e: free diving f: hiking