In which of the following regions would one likely NOT find a tropical rain forest?
A) Equatorial Africa B) The Amazon region in South America
C) The Pacific Northwest in the United States D) Southeast Asia
C
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Bacteria are more important in the ____________________ than in the carbon or phosphorous cycle
Fill in the blanks with correct word
How come an animal's carbon-14 levels do not start to decrease until it dies?
A. because it constantly replenishes its carbon-14 supply by eating plants with carbon-14 in them B. because it constantly replenishes its carbon-14 supply by breathing air with carbon-14 in it C. carbon-14 only starts to decay after the animal dies D. The carbon-14 levels do not decrease because the carbon-13 in its skin protects it from cosmic rays. E. because it is constantly being bombarded with cosmic rays
Which shape is likely to need more material for a critical mass, a cube or a sphere? Why?
A) a sphere because it has the greater surface area to volume ratio B) a sphere because it has the smaller surface area to volume ratio C) a cube because it has the greater surface area to volume ratio D) a cube because it has the smaller surface area to volume ratio
How are atmospheric CO2 levels affected by the presence of land plants?
What will be an ideal response?