A butterfly drinks nectar from a flower. A robin builds a nest in a tree. A hawk swoops down and catches a rabbit. These are all examples of interactions between living things and parts of their environment. Living things interact with their ecosystem in different ways. Sometimes these interactions help one of the organisms but harm another. For example, some organisms are predators that hunt prey. During a predator-prey interaction, the predator benefits. It gets food by catching and eating the prey. However, the prey organism dies. Examples of predator-prey interactions include frogs catching and eating mosquitoes and cheetahs catching and eating other animals. Sometimes the interactions between organisms help both living things. For example, when a bee drinks nectar from a flower, it gets pollen on its body. When it flies to another flower, the bee rubs the pollen onto it. The bee benefits from the interaction because it gets nectar to eat. The second flower benefits because the bee pollinates it. When a flower is pollinated, it is able to make seeds. Egyptian plover birds and crocodiles also interact in a way that benefits both animals. Crocodiles often get leeches on their skin. The leeches are harmful to the crocodile. Egyptian plover birds pick the leeches off the crocodiles and eat them. The birds benefit from the interaction because they get food to eat. The crocodiles benefit because they get rid of the harmful leeches. Discovery Education Science © 2007 Discovery Communications, LLC Page 1 of 2 Interactions in Ecosystems Living things also depend on nonliving things in their ecosystem to survive. Water is a very important nonliving thing. Frogs need to lay their eggs in water. Fish depend on water to breathe. Plants take in water through their roots. They use the water to help them grow and make food. Sunlight is another nonliving thing in an ecosystem. Plants need sunlight to make food by a process called photosynthesis. Some land organisms, such as lizards and snakes, depend on sunlight to warm their bodies. Wind is another nonliving part of an ecosystem. Some plants, such as dandelions and maple trees, depend on the wind to carry their seeds to new places. Living things are constantly interacting with their environment. They interact with both living and nonliving things. And they depend on many of these interactions to be successful. Discovery Education Science © 2007 Discovery Communications, LLC Page 2 of 2
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