_____________ can directly use the energy of sunlight to make their own food, and _____________ must rely on other organisms to provide the energy they need to survive.
a. autotrophs; heterotrophs
b. heterotrophs; autotrophs
c. photosynthetic organisms; autotrophs
d. autotrophs; photosynthetic organisms
e. heterotrophs; photosynthetic organisms
A, autotrophs are plants and microbes that take in small uncomplex substances for energy, such as sunlight and carbon dioxide, and heterotrophs must take in complex substances for energy, such as animals and plants.
