The most common terrestrial animals are
A. birds.
B. reptiles.
C. mammals.
D. insects.
D. insects.
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Consider the following: on an annual basis, C exchange from photosynthesis is 120 Gt, decomposition is 60 Gt, respiration is 60 Gt, ocean uptake of CO2 is 92 Gt of C, ocean release is 91 Gt of C, release of C to the atmosphere from anthropogenic
sources (fossil fuel use and land use change) is 6 Gt, and the atmosphere is increasing by 3.2 Gt of C. If terrestrial processes are responsible for the remaining C for net balance of the C cycle, then which of the following is likely? A) The terrestrial surface is a net sink of 1.8 Gt of C. B) The terrestrial surface is a net source of 1.8 Gt of C. C) The terrestrial surface is a net sink of 2.8 Gt of C. D) The terrestrial surface is a net source of 2.8 Gt of C.
The fluid material located outside of the nucleus is the
A. vacuole. B. protoplasm. C. cytoplasm. D. nucleoplasm.
A rock contains 18 mg of the radioactive isotope carbon-14. The half-life of carbon-14 is 5,600 years. How many half-lives and years will it take before the carbon-14 decays to less than 4 mg?
A. 1 half-lives; 5,600 years B. 2 half-lives; 11,200 years C. 4 half-lives; 22,400 years D. 9 half-lives; 50,400 years E. 3 half-lives; 16,800 years
All forms of horizontal gene transfer require both the recipient and donor bacteria to be alive.
Answer the following statement true (T) or false (F)