The Percentage of Biomass Regularly Recycled in the Euphotic Zone

question 17

Multiple Choice

The percentage of biomass regularly recycled in the euphotic zone is about:

• A) 1%.
• B) 10%.
• C) 30%.
• D) 50%.
• E) 90%.

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Definitions:

Ethers

A class of organic compounds containing an oxygen atom connected to two alkyl or aryl groups.

Boiling Points

The temperature at which a liquid turns to vapor at a given pressure, characteristic for each substance.

Nonhydroxylic

Pertaining to a compound or substance that does not contain hydroxyl groups (-OH).

Isopropyl Tert-Butyl Ether

A chemical compound, an ether, formed from the reaction between isopropyl alcohol and tertiary butyl alcohol.