People kill.Animals kill.Animals and people kill for food,or they kill their enemies.People and-|||-animals can move around and find something to kill.They can run away from an enemy.They can-|||-kill it if it is necessary.-|||-Many kinds of animals eat plants.The plants cannot run away from their enemies.Some plants-|||-make poison.If an animal eats part of the plant,it gets sick or dies.Animals learn to stay away from-|||-these plants.There are many kinds of plants that make poison.Most of them grow in the desert or in-|||-the tropics.-|||-Today farmers use many kinds of poison on their farms.Most of these poisons come from petroleum.-|||-It is found under the surface of the earth,and it is expensive. Scientists col poisonous plants and study-|||-them,Maybe farmers can use cheap poison from plants instead of expensive poison from petroleum.-|||-阅读上面的短文,回答问题。-|||-1.Why do people and animals kill?-|||-2.What do animals learn about these poisonous plants?-|||-3.Where do most poisonouous plants grow?-|||-4.Why do farmers use poison on their farms?-|||-5.Where do most poisons come from?-|||-6.Why do scientists collect and study poisonous plants?