The ear size of goats living in cold regions is smaller than that goats living in warm regions.explain the advantage of having smaller ear size in cold regions?

The main advantage of having small size ear in cold reason is to protect the body heat to fell warm in cold surroundings.

Explanation:

The ear size is directly related to the heat exchange rate of our body. Greater the ear size, greater will be the surface area to dissipate the body heat. So, the goats living in warm areas have big size ear, so that they can release more body heat to surrounding to stay cool. In the same way in cold areas, goats have to conserve the body heat so they tend to have small sized ear.

The correct answer is C.The pesticide is traveling through the food chain.

Explanation:

The pesticide is used to kill pests that harm our crops but these pesticides have harmful effects on animals live there. These pesticides get into herbivores body when they eat crops on which pesticides are used.  

Then when these primary consumers are eaten by carnivores the pesticide gets transferred to them and like this, they travel in the food chain. So by this pesticide can be found in carnivores that live far from the land.  

The level of pesticide gets increased in animals present at a higher level which is called biomagnification. So the right answer is C.