Vocabulary
Matter & Energy
Healthy & Unhealthy
Ecosystem Changes
Miscellaneous

100

An animal that captures and eats other animals is called a ________________.

An animal that is captured and eaten is the _________.

Predator

Prey

100

Since humans can eat foods from many different ecosystems, they are:

part of many food webs.

100

In a healthy ecosystem, many different kinds of organisms can ____________.

meet their needs.

100

A natural change to an ecosystem occurs when

a change occurs that do not involve people

100

True or False:

Humans cause more negative changes to ecosystems than positive.

True

200

A(n) ________ species is a non-native organism that causes harm to the environment.

invasive

200

Living things obtain ______ from their environment and release ______ back into it.

matter; waste

200

Scientists studied the relationship between wolves and moose on Isle Royale. Their study showed that in a healthy ecosystem,

the numbers of predators and their prey must be balanced.

200

What kinds of changes take place during succession?

A slow replacing of species in the ecosystem. This happens in one direction from few species of small organisms to many organisms of all sizes.

200

People use resources such as __________, ________, and  _________ to generate useful energy.

natural gas, coal and oil

300

Anything that people add to the environment that harms living things is considered

pollution

300

What do all food chains have in common?

They all begin with a producer.

300

If just one species in a food chain disappears,

any organisms that depend on that species for food will not be able to meet their needs.

300

After a forest fire, new plants and those that were not burned will ______ because the fire released nutrients into the soil.

grow faster

300

Clearing prairies to plant crops is a negative change to ecosystems because

the way organisms interact in food webs is disrupted.

400

All the goods and services people need or want are either made of __________ or produced using them.

Natural Resources

400

Why is the base of an energy pyramid larger than the top?

Energy is lost as heat at each level so less energy is available at the top

400

On Isle Royale, many wolves died because they had less food. With fewer predators, the number of moose

increased quickly

400

Climate change can cause changes to ecosystems. What can happen to organisms that do not change with their ecosystems?

They can disappear from Earth.

400

An example of a disturbance in the ecosystem is:_______________________.

Examples include: a volcano eruption, a drought, a tornado, a forest fire

500

An event that changes an ecosystem for a long period of time is called a ______________.

Disturbance

500

How are food webs related to food chains?

Food webs consist of overlapping food chains.

500

Herons will sometimes stand motionless in their habitat for an hour, waiting to catch their prey. They’ve even been known to swallow turtles whole. What would happen to the herons if the number of turtles decreased  in this habitat?

The herons’ food supply would decrease and hurt their survival.

500

After an ecosystem has been destroyed, it

can usually can be restored.

500

True or False:

Many changes in an ecosystem occur in cycles.

True (seasons are an example of a change that occurs in a cycle).