There were lot of organisms A in the crop fields in an area. These organisms used to feed on organisms B also present in the crop fields but which damaged the standing crops. One day some people arrived in the fields and killed all the organisms A so that they could remove their C for making fancy items which were in great demand. Due to large scale killing of A, the population of B increased too much damaging all the crops in the area and causing a famine-like situation. Apart from A, there is another organism D which can also kill and eat B. Name A, B, C and D.
Organisms A is a snake as it is used to feed on organisms present in the crop fields and they are used for making fancy items which were in great demand.
Organisms B is rat as it damaged the standing crops. Their increase in population can cause complete spoilage of standing crops and can cause a famine-like situation.
C is snake's skin as organism A's (snake) skin is used for making fancy items which were in great demand.
Organism D is a cat as, apart from the snake, a cat can also kill and eat the rat.
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