If "F" is the dominant gene for fast growing plants, how many slow-growing plants (ff) are created when an "Ff" plant is crossed with a "ff" plant? (How many "ff" will be made?) IF ITS WRONG IMMA BE SO MAD

should only be 2

Explanation:

when you do a punnet square F only transfers o 2 of the plants, while f transfers to 4. Since F is dominante  2 will be fast growing plants.

So sorry if it's wrong.

substitution is the answer in this case

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.