The current total world population has just passed ________
A) 6 billion B) 5 billion C) 7 billion D) 9 billion E) 8 billion
Answer: C
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Another name for a nutrient cycle in an ecosystem is a
A. menstrual cycle. B. hydrogen cycle. C. diurnal cycle. D. biogeochemical cycle.
Seedless vascular plants lived in low wet habitats because
a. they needed water to reproduce. b. they did not have a means to transport water through their structure. c. they had no protection from desiccation. d. they were a food source for amphibians. e. none of the above
The Fifth Assessment Report of the Intergovernmental Panel on Climate change reported with high confidence that a few recent species extinctions are ________
A) accidental B) evolutional C) pivotal D) anthropogenic E) about to be reversed
Geosynchronous satellites that always appear at the same place in the sky are
A. beyond the pull of Earth's gravitational field. B. moving at a speed just short of escape velocity. C. stationary in space. D. orbiting Earth with a 24-hour period.