Groups of organisms with low biotic potential, such as gray whales, ________
A) are r-selected
B) are K-selected
C) show the initial stages of the extinction process
D) are not subject to density-dependent limiting factors
E) have escaped from the processes of natural selection and adaptation
B
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Some desert plants reduce evaporation by closing their pores during the day and opening them at night to take up___________ ____________
Fill in the blanks with correct word
With distance from the spreading ridge, oceanic lithosphere becomes ________ and it ________
a. younger; subducts b. older; subducts c. younger; subsides d. older; subsides
According to water resource experts, one of the two major causes of water waste is ____.
A. leakage B. long showers C. old toilets D. dishwashers E. cheap prices
Which of the following is not a proxy used for climate?
A. Weather instrument data B. Ice cores C. Cultural records D. Tree rings