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(CHAPTER 1 / SECTION 1) LIVING THINGS AND THE ENVIRONMENT Living Things and Their Environment • An organism or type of living thing needs to obtain food, water, shelter and other things it needs to live, grow, and reproduce from its environment. • An environment that provides the things an organism needs to live is called its habitat. Factors in an Environment Biotic – living parts of the environment. Ex. producers and consumers. Abiotic – nonliving parts of the environment. Ex. water, sunlight, oxygen, temperature, and soil. Biological Complexity • Living organisms can be studied at different levels of complexity. Biosphere Biome Ecosystem Community Population Individual Populations A species is a group of organisms that are similar and can reproduce with each other. A population is a group of Migrating wildebeest population organisms from the same species occupying in the same geographical area. This area may be difficult to define. Why? Tiger populations comprise widely separated individuals Communities and Ecosystems • A community is all the populations that live together in an area. • An ecosystem is the community of organisms that live in a particular area along with their nonliving surroundings. * The community and the abiotic factors together form an ecosystem. Ecology • The study of how living things interact with each other and their environment.