When did dinosaurs, exclusive of birds, become extinct?
A. 6,600 years ago
B. 66 million years ago
C. 660 million years ago
D. 6.6 million years ago
Answer: B
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Which nation-state(s) produce the most diamonds in Sub-Saharan Africa?
A) Nigeria B) South Africa C) Botswana D) Namibia E) South Africa, Botswana, and Namibia
The gases oxygen and carbon dioxide move in and out of cells through
A) diffusion. B) facilitated diffusion. C) active transport. D) endocytosis.
The maximum population that a species can attain in a particular environment due to limiting factors is called its ________ capacity.
Fill in the blank(s) with the appropriate word(s).
Tropical disturbances
A) usually turn into hurricanes. B) have substantial rotation. C) have weak pressure gradients. D) form near the western portions of ocean basins.