Rearrange the following sentences

Writing
Rearrange the following sentences to form a good paragraph.

1. Zoologists, the people who study animals, classify them according to the structure of their body.

2. This is known as classification.

3. Animals are often grouped together according to their similarities.

4. The simplest scientific grouping is the species, animals that are basically alike and breed among themselves.

5. For example, some animals live in water, some on land; some are meat-eaters, some eat plants, and some eat both.