Approximately ________ million years ago, glaciers were widespread in Antarctica as the cold waters of the Southern Ocean efficiently flowed around and isolated the continent.
A. 34
B. 14
C. 10
D. 47
Answer: A
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a type of genetic drift describing the loss of the allelic variation that accompanies founding of a new population from a very small number of individuals
What will be an ideal response?
Which of the following best describes the human population from early times to the present?
A) early rapid growth, which has leveled off to a nearly constant rate in the last 20 years B) slow, uneven growth until the 1800s, then increasingly rapid growth C) rapid, explosive growth throughout the period D) slow, steady growth throughout the period E) early rapid growth, which has increased rapidly in the last 20 years
Under what regulation are hazardous waste permit holders must use a cradle-to-grave system?
A. The Superfund Act B. The Comprehensive Environmental Response, Compensation, and Liability Act C. The Resource Conservation and Recovery Act D. The Toxic Release Inventory Act E. The Clean Air Act
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