An antigen is Group of answer choices a protein or nucleic acid. a nucleic acid only. a molecule that can elicit an immune response. a protective protein that the immune system produces.

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls

c should be the answer