The productivity of an ecosystem refers to the
A. amount of food consumed by the organisms per unit space.
B. reproductive output.
C. amount of biological material produced during a certain period of time.
D. average number of offspring produced per adult female per unit time.
Answer: C
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Excessive groundwater withdrawals can cause ________.
a.) an influent stream to become an effluent stream b.) expansion of the dewatered aquifer c.) the water table to drop or decline in elevation d.) porosity in the aquifer to increase as the water is removed
In meteorology, the term thermal belt refers to the extreme heat sometimes found inside a car. Indicate whether the statement is true or false
Repeatability in an experiment is important because
A. independent investigators must be able to get the same results. B. only independent investigators must be able to get the same results and it helps to support the initial hypothesis. C. it helps to support the initial hypothesis. D. it eliminates bias. E. All of these are correct.
Which of the following is NOT an external cost that affects people who are not involved in some environmentally damaging transaction?
a. water pollution b. aesthetic damage c. job security d. human health problems