The metabolic process in which organic molecules are synthesized from water and carbon dioxide (CO2), using radiant energy of the sun captured by chlorophyll-containing cells:
a. abiogenesis
b. paleontology
c. speciation
d. photosynthesis
e. sexual reproduction
D
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As oceans become more acidic, the shells of tiny sea snails tend to dissolve. This is a concern because:
a. The snail shells provide material for jewelry making on south sea islands. b. The shells are ground up and used for fertilizer for agricultural crops. c. The snails are the base of a food web that supports entire polar ecosystems. d. More than one of these are correct. e. None of these answers.
Which of these shapes of equal height has the lowest center of gravity?
A. Sphere. B. Cube. C. Cone resting on its base. D. all the same
Why is silicate the most prevalent mineral in igneous rock?
A) Silicates melt very easily. B) Silicates make up most of the earth's crust. C) Silicate is attracted to heat. D) Silicates are very heavy, so they are perfect for magma.
Radiation
A) is more like conduction than like convection. B) supplies only a minute portion of the earth's energy. C) cannot be thought of as consisting of particles. D) can be transferred through a vacuum.