What substance can enter the cell by diffusion without having to be digested

Air

Explanation:

It doesn't need to be digested because it goes to your lungs and blood

haploid cells;

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