A population of crabs live in an environment with white colored sand. Half of the crabs have white shells, and half have brown shells. Which color crab do you think is more likely to survive? What will the next generation of crabs look like? Explain your answer.

The crabs with white shells. The next generation of crabs will be white shelled.

Explanation:

The crabs with white shells are more likely to survive because they blend in with the white sand more than the ones with brown shells making it easier to hide from predators and also makes it a desired trait.

youre right there are

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.