If a human-induced mass extinction takes place, approximately how long will it take for life on Earth to recover?
A. 5 million years
B. 200,000 years
C. 5000 years
D. 1 million years
Answer: A
You might also like to view...
The most vexing problem facing European urban planners is
A) suburban sprawl B) inner-city crime C) traffic congestion D) poor zoning laws E) a crumbling urban infrastructure
What is indicated by a gasoline's octane rating?
A. the degree at which the compound ignites B. the degree of branching in the gasoline hydrocarbons C. the percentage of octane in the mixture D. a measure of how many degrees it takes to ignite a mixture of octane E. none of the above
When several cities grow and merge together into vast urban areas, they are called
A) primate cities. B) regions. C) agglomerations. D) conurbations.
Hydrothermal vents are called "black smokers" because of the black water emitting from the vents due to the
precipitation of inorganic sulfides. a. True b. False