3rd Grade Part Six Review

Interactions in Ecosystems Ecosystems include populations, communities, and habitats, as well as, nonliving things like air, water, and soil. Plants and animals depend on one another to help them meet their needs. Interactions – includes food chains, food webs, predator-prey relationships, and living and nonliving

How can ecosystems be changed? Natural events such as floods, fire, earthquakes, etc. Humans Animals

Ecosystems Forests an area with mostly trees receive different amounts of rainfall, sunshine, and specific temperatures Deserts an area with very little rainfall some are hot and others cold

Ecosystems Freshwater Mostly found in rivers, streams, and lakes Saltwater Found in oceans, seas, and some lakes

Food Chains ProducerConsumer The path of energy from one living thing to another forms a food chain. Energy from the sun is used to produce sugar in plants which is then passed on to animals. Animals must consume their food from other organisms.

Food Chains ProducerConsumer Prey Predator Animals that hunt other animals for food are predators. Animals that are hunted are prey.

Decomposers Decomposers are living things that break down dead things for food. They help clean the environment as they break down the wastes of other living things.

Learned Behaviors Behaviors animals are taught after birth

Food Web Most ecosystems have many food chains that overlap and link together. When a population increases or decreases, it can affect other populations in the food web.

Energy Pyramid Shows the amount of energy available to pass from one level of the food chain to the next. The higher the animal is in the pyramid, the fewer there are. hawk snake rabbit grass