Eureka! chapter 9 lesson

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Scientists and Engineers are Persuasive

Objects in contact exert forces on each other.

When the environment changes in ways that affect a place’s physical characteristics, temperature, or availability of resources, some organisms survive and reproduce, others move to new locations, yet others move into the transformed environment, and some die.

For any particular environment, some kinds of organisms survive well, some survive less well, and some cannot survive at all.

Populations live in a variety of habitats, and change in those habitats affects the organisms living there.

The sun is a star that appears larger and brighter than other stars because it is closer. Stars range greatly in their distance from Earth.

Human activities in agriculture, industry, and everyday life have had major effects on the land, vegetation, streams, ocean, air, and even outer space. But individuals and communities are doing things to help protect Earth’s resources and environments.

The food of almost any kind of animal can be traced back to plants. Organisms are related in food webs in which some animals eat plants for food and other animals eat the animals that eat plants. Some organisms, such as fungi and bacteria, break down dead organisms (both plants or plants parts and animals) and therefore operate as “decomposers.” Decomposition eventually restores (recycles) some materials back to the soil. Organisms can survive only in environments in which their particular needs are met. A healthy ecosystem is one in which multiple species of different types are each able to meet their needs in a relatively stable web of life. Newly introduced species can damage the balance of an ecosystem.