No living thing or group of living things can live and grow in iso-lation. All organisms, both plants and animals, need1 energy to develop and all species of living things influence the lives of others. Ecology is a science. It studies how plants, ani¬mals and other living things live in relation to each other and to their environment. People have always studied living things in their natural environment, in other words, they have al¬ways studied the air, the water, the soil and all the other things that surround a person, animal or plant. The environment can in¬fluence the growth and health of living things. Ecologists also study what happens to different species. They collect information about their population number, diet, form, size and behaviour. Ecology is one of the most important sciences nowadays. It teaches us how to survive in the modern world. 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 teaches us ... . 5) Ecologists collect information about ....