Organisms that must obtain nutrients and energy by eating other organisms are?
a) multicellular
b) autotrophic
c) heterotrophic
d) eukaryotic

Answer;

-Heterotrophic

Explanation;

-Heterotrophs are organisms that consumes other organisms in a food chain.

-In contrast to autotrophs, heterotrophs are unable to produce organic substances from inorganic ones using the process of photosynthesis. They must rely on an organic source of carbon that has originated as part of another living organism. Heterotrophs depend either directly or indirectly on autotrophs for nutrients and food energy.

-Herbivores, omnivores, and carnivores are all examples of heterotroph because they eat other organisms to get proteins and energy. They cannot produce their own food or energy.

i think that it is plants

the question isn't complete here so i can't right an answer '_'