Apolyclonal response to an infection occurs because most antigens have multiple

Epitopes.

Explanation:

Polyclonal response may be defined as the immune response that ensures the recognition and killing of the antigen. A particular antibody is produced to kill the specific antigen.

Antigens contain epitope that binds with the paratope of antibody.. The polyclonal response is generated due to the presence of multiple epitopes of the antigen. Polyclonal response increases the chances of development of auto immune disease.

Thus, the answer is epitope.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.