biology 1

Every time people do something to the environment, reactions usually happen as predicted.

False

Introducing additional organisms of the same existing kinds will not upset the ecosystem.

False

Nature is not balanced as long as a state of dynamic equilibrium exists.

False

Only people upset the balance of nature.

False

All forms of life on earth are linked together in some type of food relationship.

True

Everything living depends on something else for its life.

True

Habitats vary because environmental factors vary.

True

Nothing is free in nature; what is removed must be replaced.

True

Organisms with similar requirements usually compete for environmental factors.

True

The ultimate source of energy for physical life on earth is the sun.

True

Unnatural occurrences can have the most significant impact on an ecosystem.

True

Energy moves through the plants and animals in an ecosystem by way of _____.

a food chain

The state that is ultimately reached which results in balance is called .

equilibrium

The diversity of plants and animals on Earth is supported by the numerous kinds of available.

habitats

A habitat that has lots of light and water, a high elevation, low temperature, and a low level of oxygen is most likely a _____ habitat.

high mountain

The word ecology is made up of two Greek words, oikos and logia, and means "_____."

house knowledge

Common needs, mutual benefit, and interactions are all examples of .

interdependence

The basic materials needed for life originate from the environment.

nonliving

Which statements reflect dynamic equilibrium of an ecosystem?

number of existing organisms will reflect changing factors any change on either side will require a compensation on the other side

Environmental factors may be studied using .

space satellites

How do phytoplankton affect the ecosystem of the entire earth?

through the oxygen cycle