Differences in courtship or other behaviors prevent mating. 1-x geographical 2. Anatomical 3. Temporal 4. Behavioral

i think the answer would d

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.

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.