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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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.
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
Another name for a nutrient cycle in an ecosystem is a
A. menstrual cycle. B. hydrogen cycle. C. diurnal cycle. D. biogeochemical cycle.
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