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

Environmental & Atmospheric Sciences

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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.

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

Another name for a nutrient cycle in an ecosystem is a

A. menstrual cycle. B. hydrogen cycle. C. diurnal cycle. D. biogeochemical cycle.

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences