How biotic and abiotic factors influence each of these levels
Species
Population
Community
Ecosystem
Biome
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People who exercise for an hour may have lower cholesterol levels. is that a statement? a law? or a hypothesis?

Ascientist is studying muscle twitches in chicken quadriceps. to activate the muscle, he needs to provide stimulus to the

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.