Which of the following is the best explanation of alternation of generations?
a. alternation of generations means that most plants can reproduce either sexually or asexually.
b. this concept indicates that most eukaryotes reproduce sexually at least some of the time.
c. the diversity produced by sexual reproduction to reduce parasitism.
e. the plant life cycle alternates between two distinct, multicellular reproductive stages—one diploid and one haploid—that give rise to each other.

e.The plant life cycle alternates between two distinct, multicellular reproductive stages—one diploid and one haploid—that give rise to each other.

Explanation:

Alternation of generation refers to alternation of multicellular diploid and haploid forms in an organism's life cycle. It is found in some plants and algae. In plants it is as follows:

Thus, alternation can be observed between diploid sporophyte and haploid gametophyte.

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.

d. organisms have cells with different shapes and functions.