The Keeling curve in Figure 25.1 shows that while CO2 levels oscillate on an annual basis, overall CO2 levels increase from year to year. Why has this trend continued in the last 50 years?
A. increasing rates of aerobic respiration
associated with the rise in world population
B. decreasing rates of oxygenic
photosynthesis by plants and algae
C. clearing of forests to create agricultural
land outside the tropics
D. combustion of fossil fuels
D
You might also like to view...
Chronic myelogenous leukemia (CML) is caused when a segment of chromosome 9 and a segment of chromosome 22 both break off and switch places. How is this mutation classified?
A. deletion B. duplication C. inversion D. translocation E. reciprocal translocation
The visible indentation that forms on the exterior of a dividing animal cell is called the ________
a. cleavage furrow b. gray crescent c. contractile ring d. cell plate
Correctly rephrase the following famous quote from J. B. S. Haldane. "I would lay down my life in order to save two brothers or __________________."
A. one son or daughter B. four cousins C. three uncles D. two nephews and one son or daughter E. two grandsons or granddaughters Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about kin selection? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
At the top of a pyramid of biomass are the
a. primary producers. b. secondary producers. c. primary consumers. d. secondary consumers. e. tertiary consumers.