Asedimentary rock is found to be 300 million years old. which type of organism is not likely to be found in the rock?
a) insects
b) mammals
c) fish
d) land plants

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.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms