Maria and Carlos should look for stems, and roots, leaves and bark. If there are stems or roots,etc. then it would be a plant. Fungus doesn't have stems, roots, leaves and bark.
White blood cells control what comes in and leaves. If you ever have an infection in your body, these cells are what come to destroy the infection in your body.
I think the green plant population would decrease as more consumers that the predator eats would increase as the African wildcat population decreases. You would have more consumers that would consume the green plant population.
Food webs connect everything to each other, displaying all possible energy paths, whereas foodchains have one path of energy.