1. Voluntary muscle movements are controlled by the . brain
2. The cardiac muscle in the heart is a(n) muscle.
smooth
3. The muscle in the legs is a voluntary muscle.
involuntary
4. When you move your arm, you using a(n) muscle.
striated
5. The involuntary muscles in your intestines are muscles.
blink
6. When you you can use either involuntary or voluntary muscle movement.

Explanation is in the file

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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.