people kill. Animal kill. Animal and people kill for food, or they kill their enemies. People and animal 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 animal eat plants. The plant can not run away from their enemy. Some plants are poisonous. If an animal eats part of the plant, it get sick or dies. Animals learn to stay away from these plant. There are many kinds of plants that make poison. Most of them grow in the desert or tropic.
Farmer use many kinds of poison on their farms. Most of these poisons come from petroleum, but petroleum is expensive. Scientist collect poisonous plants and study them. Maybe farmers can use cheap poison from plant instead of expensive poison from petroleum.
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