Question

which of these is a producer?
moth
mushroom
fern
cheetah

Explanation:

Producers in an ecosystem are organisms that can make their own food through photosynthesis (or similar processes), typically plants or algae. A moth is an animal (consumer), a mushroom is a fungus (decomposer), a cheetah is an animal (consumer), while a fern is a plant that can perform photosynthesis to produce food, so it is a producer.

Answer:

C. fern