Earth Has ________ Species of Animals Compared to the Number

question 13

Multiple Choice

Earth has ________ species of animals compared to the number of plant species.

• A) many fewer
• B) about 100 fewer
• C) about 100 more
• D) many more
• E) about the same number of

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Definitions:

Thoracic Cavity

The chamber of the body of vertebrates that is protected by the thoracic wall and contains the lungs and heart.

Ventral Cavity

A large body cavity that houses many organs, including those in the thoracic and abdominal regions.

Feedback Mechanism

A process in biological and mechanical systems where the system's output is fed back into the system as input, adjusting its performance to meet a desired goal.

Effector

An organ or cell that acts in response to a stimulus, often involved in muscle contraction or gland secretion.