Uranium-235, with a half-life of 713,000,000 years, decays to Lead-207. If a rock sample is determined to have one-quarter of the uranium-235 content it had when it formed, the age of the rock sample can be estimated to be approximately __________ years old.
A. 28.5 billion
B. 713. million
C. 1.4 billion
D. 178 million
Ans: C. 1.4 billion
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In which of the following habitats would you expect to find the largest number of K-selected individuals?
A) a recently abandoned agricultural field in Ohio B) the sand dune communities of south Lake Michigan C) the flora and fauna of a coral reef in the Caribbean D) South Florida after a hurricane E) a newly emergent volcanic island
One observer noted that a male wood duck from Florida mated with a female wood duck from California. This is an example of
A. gene flow. B. gene frequency. C. range. D. age distribution.
The light reactions of photosynthesis result in which of the following?
A) Oxidation of chlorophyll B) Oxidation of CO2 C) Production of ATP D) Reduction of H2O E) Oxidation of glucose
Which group(s) of organisms are most likely to fix CO2 via the Calvin cycle?
What will be an ideal response?