In an ecosystem living things depend on each other and on nonliving things. Living things have adapted to their habitats. Ecosystems change because of natural causes and human alterations. People can choose to respect living things and help to restore or preserve ecosystems. Water cycles through living and nonliving things.
Water is essential to all living things.
The ways people acquire and use water affect living things. People can choose to conserve water, maintain or improve its quality, and protect specific bodies of water. The homes of wild animals and human beings are made from natural resources. People use and affect natural resources. People can choose to conserve and protect natural resources.