All stresses are manmade.

Man honors God by using His resources to benefit themselves.

Photosynthesis and respiration are part of the nitrogen cycle.

Areas of the earth that have only two seasons usually have a wet season and a dry season.

Fires are never beneficial to an ecosystem.

Consumers get nitrogen compounds by eating other animals or plants.

Carbon dioxide is released into the air during decomposition.

A _____________ is a regular pattern of change.

Bacteria that can change nitrogen into compounds can be found in __________ nodules on plants.

The year is divided into ____________ which is one of the earth's cycles.

The water cycle includes all of the following except ...

During respiration organisms use _________ molecules and oxygen to produce energy.

Plants release water vapor into the air through condensation.

Any physical hazard to life caused by having too much or too little of things needed for life is called a _______.

The largest manmade stress is probably _________.

Whenever an ecosystem receives more water than it can store or use, droughts occur.

Whenever an ecosystem receives less water than it needs, a ________ occurs.

The gradual changes in the populations of organisms in an ecosystem are called succession.

Plant and animal species that originally live in an ecosystem are called endangered species.

When the last know member of a species dies, the species is considered __________.

When the population of a species is so small that the species may soon become extinct, it becomes __________

Species that are not native to an ecosystem and can cause harm are ________.