Which of the following acts as a carbon source within the carbon cycle?
A. photosynthesis by plants
B. the harvesting of fossil fuel from within the earth
C. release of carbon dioxide into the air by the ocean
D. respiration from humans and animals
Answer: D
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Antiseptics are generally regulated by the
A. Food and Drug Administration. B. The National Institutes of Health. C. Centers for Disease Control and Prevention. D. Environmental Protection Agency.
Given what you now know, what information is most likely to produce the correct answer?
What will be an ideal response?
Explain how the field of human biochemical genetics had its beginnings partly through the persistence of a young
mother. What will be an ideal response?
The leukocytes called natural killer lymphocytes
A. release prostaglandins and leukotrienes in response to microbes. B. increase in allergies and helminth infection. C. respond to the coating of a pathogen by complement. D. are nonspecific leukocytes that secrete toxins onto the surface of virus-infected cells. E. are specialists in killing bacteria.