ANIMALS AND PLANTS

No one knows how many different kinds of plants and animals there are. Many of them provide us with food, clothing, shelter and medicines. Some, including several kinds of insects, pierce our skin and feed on the blood.

Others, both plants and animals, even live and grow inside our bodies. In this way they may cause disease. You can see why scientists study living things with great care. Our lives may depend on how much we have learned about the living things around us.

As there are so many different kinds of plants and animals, the task of the biologists is not an easy one. To keep track of the great number of living things a system of classification has been set up. Plants and animals are sorted into groups according to the way they are built. For example, the tiger, the leopard, and the lion will be all grouped together. All of them belong to the cat family. All the members of the cat family, in turn, belong to a larger group that includes such meat-eating animals as the dog the bear. They have teeth that are built for tearing and cutting flesh. Their sharp claws help them to capture and eat their prey. In this way, all plants and animals were classified by their structure. All living plants and animals were divided into three kingdoms: the animal kingdom and the plant kingdom and the fungi.

Among the smallest and simplest living things there are some that are difficult to classify. There are tiny plant-like cells that can swim about actively in the water. In some cases, the classification of these is still in doubt.

The animal kingdom, as we have seen, includes many thousands of different animals. Scientists classify them further as follows:

<== попередня сторінка	\|	наступна сторінка ==>
Pay attention to the use of the Active Infinitive in the following sentences, state its function and translate the sentences into Russian.	\|	Animal kingdom

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