Hydrothermal vent communities are unusual because
A) a primary producer synthesizes organic matter.
B) a producer exists without sunlight.
C) a consumer eats a producer.
D) there are no producers in the ecosystem.
B
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In 2014 the population of Earth is estimated to be about 7.2 billion
Indicate whether the statement is true or false.
The Earth has always had an atmosphere about the same as it is today
Indicate whether the statement is true or false
The primary difficulty that must be overcome in the use of desalination plants to provide fresh water is __________.
-the destruction of marine life by the process -high maintenance costs for the plants -poor quality of water produced by the plants -the high cost of energy involved -environmental damage from the brine effluent