Сначала надо прочитать

No living thing or group of living things can live and grow in isolation. All organisms, plants and animals need energy to develop and all species of living things influence the lives of other. Ecology is a science. It studies how plants, animals and human beings live together and influence each other. It is also a science about our environment. People have always studied living things in their natural environment. In other words, they have always studied the air, the water , the soil and all other things that are around a person, animal or plant. The environment can influence the growth of living things ans the way they develop. Ecologists also study what happens to different species, how they change. The scientists collect information about the number of living things in different areas, their size and behaviour. Ecology is one of the most important sciences in the 21st century. It teaches us how to survive in the modern word.

Read the text "what is Ecology?"again and complete the sentences
1) Ecology is a..
2) Ecology studies..
3) A natural environment is..
4) Ecology teacher us..
5) Ecologists collect information about.