The Total Number of Classified Species Known to Science Is

question 60

Multiple Choice

The total number of classified species known to science is roughly

• A) 500,000.
• B) 1 million.
• C) 2 million.
• D) 5 million.
• E) 10 million.

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Definitions:

Blood Pressure

A measure of the force that circulating blood exerts against the walls of the arteries.

Cellular Metabolism

The complex set of life-sustaining chemical reactions that take place within cells, involving the processing and energy conversion of nutrients.

Carbon Dioxide

A colorless, odorless gas produced by burning carbon and organic compounds and by respiration, essential to the photosynthesis process in plants.

Oxygen

A chemical element vital to human respiration and the combustion process, symbolized as O.