Which statement about the difference between autotrophs and heterotrophs is true?
a. autotrophs transform radiant energy into chemical energy, but heterotrophs can’t.
b. autotrophs take in only oxygen, but heterotrophs take in both oxygen and carbon dioxide.
c. autotrophs have two different electron transport systems, but heterotrophs have none.
d. autotrophs don’t have a calvin cycle, but heterotrophs do.
humans have to grow, hunt, and gather food, but many living things aren't so constrained. plants, algae and many species of bacteria can make their own sustenance through the process of photosynthesis. they harness sunlight to drive the chemical reactions in their bodies that produce sugars. humans have complicated digestive system and are not designed to use photosynthesis to process their food.
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hormones such as insulin.
answers: [a]: " increased herbicide use " ;
[c]: " increased plowing time " .
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