What is the main difference between an autotroph and a heterotroph? a. a heterotroph only consumes plant matter whereas an autotroph eats both plants and animals. b. a heterotroph is able to produce its own food whereas an autotroph must consume other organisms for energy. c. an autotroph is able to produce its own food whereas a heterotroph must consume other organisms for energy. d. an autotroph only consumes plant matter whereas a heterotroph eats both plants and animals.