The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is:
A. The fires significantly heat the air and cause a rise in global temperature.
B. The smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature.
C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature.
D. The rising heat from fires produces wind that cools the surface of the Earth.
E. The fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.
C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature.
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Which of the following would NOT be a characteristic of the first life forms on Earth, that is, the very first primitive cells?
A. Oxygen was required for the cells to survive. B. A molecule evolved as a way to store genetic information. C. A barrier made of organic molecules separated the "cell" from the environment. D. Chemical reactions evolved as a way for cells to capture energy from the environment.
The toxin that allows Rhizopus to cause the rice disease known as seedling blight is actually produced by ________ growing within the fungus.
A. Burkholderia and Staphylococcus, but not Clostridium B. Staphylococcus C. Burkholderia D. Clostridium E. None of the choices are correct.
Two countries, and _, account for one-third of the human population.
A. Russia; Brazil B. India; Brazil C. China; Russia D. Russia; India E. China; India
The ________ was proposed to help explain speciation that appears in the fossil record.
A. phylogenetic species concept B. morphological species concept C. genetic divergence species concept D. evolutionary species concept