________________ eat those plants or consumers to get matter for growth.

______________ get matter for growth from dead producers and consumers.

When decomposers die, the matter enters the air and soil, so _____________ can use it again.

Like matter, energy does cycles through an ecosystem.

Energy in an ecosystem moves from _________________.

At each organism in a food chain, most of the energy is lost as ______________.

_________________ are models that show how energy moves in one part of an ecosystem.

_________________ are models that show how much of the original energy is still available at each level of the food chain.

_________________ are models that show how all of the different organisms in an ecosystem are linked together.

_________________ show how matter and energy move throughout an entire ecosystem by tracking all of the feeding relationships among all the organisms.

Healthy ecosystems are ones in which _________ different kinds of organisms can meet their needs.

Isle Royale is a huge island in ___________.

Isle Royale's ____________ makes it a great ecological laboratory.

Scientists study groups of ______________ that live on the island because they have an interesting predator and prey relationship.

When the Isle Royale ecosystem is healthy, the numbers of wolves and moose are __________.

Ecosystems can be unhealthy if there are too many or too few of one type of organism.

All ecosystems change over time.

An example of a fast change to an ecosystem is ___________.

A ______________ is an event or change to an ecosystem that has lasting effects.

The changes that take place after an ecosystem has been disturbed are called _____________.

When changes in an ecosystem destroy or remove the soil, succession takes longer.

Most ecosystems do not change with the seasons.

Scientists around the world agree that Earth's climate is ________________.

If the temperature or rainfall in an environment changes, some organisms will not be able to survive there anymore.

Human impacts on an ecosystem can be _____________.

When humans change ecosystems, ___________ can be disrupted.

Which of these might have a positive impact on an ecosystem?

The human population is __________ .

Human development is often the reason that humans change ecosystems.

_____________ is anything people add to the environment that harms living things.

Someone who studies the impacts of humans on the environment is called a ____________.

________ human products use natural resources.

Natural resources include _____________.

An ecosystem can sometimes be restored after it has been damaged.

A non-native organism that causes harm to the ecosystem is called __________.