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Life science is the study of life and living things. Living things are also called organisms. Life science is often referred to as biology. Life is complex, and there are millions of species alive today. Many millions more lived in the past and then went extinct. Organisms include microscopic, single-celled organisms such as bacteria. They also include complex, multicellular organisms such as plants and animals.
Given the diversity of life, life science is a huge science. That's why a life scientist usually specializes in just one field within life science. For example, some life scientists specialize in ecology. Ecologists study the interactions of organisms with each other and their environment. Life scientists also work in many different settings, from classrooms to labs to natural habitats.
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