1. EcosystemA community of living and nonliving things in their natural environment Living Element Part of an ecosystem that requires energy to survive has basic needs that must be met Nonliving Element Part of an ecosystem that does not require energy to survive and does not have basic needs like food and water ProducerAn organism that used sunlight to make its own food for energy Consumer An organism that gets energy from eating other organisms Organism A living thing Decomposer An organism that gets energy from eating dead organisms, nonliving materials, or waste Food ChainThe path of food energy from one organism to another in an ecosystem Food Web A connection of food chains with many food energy paths in an ecosystem

2. Photosynthesis The process where plants use sunlight, water, and carbon dioxide to produce sugar and release oxygen Respiration A process by which animals use oxygen and food to make energy and carbon dioxide Population All the living things that belong that belong to the same group and live in the same area Cycle A recurrent series of events or processes in plants and animals Overpopulation Can create too much of one species, which exhausts our food supply. Can destroy habitats

3. Grazing To eat small portions of food throughout the day Flow Ecosystems maintain themselves by cycling energy and nutrients obtained from external sources. Carbon Cycle The movement of carbon on Earth by the processes of respiration and photosynthesis OxygenA gas produced by plants during photosynthesis that animals use for respiration Carbon Dioxide A gas produced by animals during respiration that plants use to make food, water, and oxygen