Environment, genetics, selective breeding, random mating, random fertilization, recombination, crossing over, etc
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I mean the nervous system is the one that feels the pain so...
I think the best answer from the choices would be the first option. Icebergs float in the ocean since i<span>cebergs are composed of freshwater and freshwater is less dense then salt water. The ocean contains salts which contributes to its density which most likely would be higher with that of an iceberg.</span>
Organism c. plants are autotrophs which means they make there own food
