Which of the following is an example of commensalism? a) birds feed off the insects that are stirred up from the grasses as cattle move through. b) a polar bear catches a seal for dinner. c) a tapeworm latches itself in the intestines of a rat, feeding off all the nutrient eaten by the rat. d) oxpecker birds eat parasitic ticks off the backs of zebras.

Commensalism is the relation ship between two species where one of the species is being benefited while the other is not benefited and not even harmed.

It is a type of symbiosis

the correct answer is

A) Birds feed off the insects that are stirred up from the grasses as cattle move through.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

there are two significant figures.