Human activities can greatly accelerate ____________________ by increasing the rate at which nitrate- and phosphate- containing effluents enter aquatic ecosystems from their surrounding watersheds.
Fill in the blank(s) with the appropriate word(s).
eutrophication
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What data were used to develop the first geologic time scales?
A. the fossil record B. analyses of radioactive elements C. uniformitarianism
Tornado frequency is highest during the spring and lowest during the winter when the warm surface air is normally absent
a. True b. False
The structure of interleukin-2 includes which of the following?
A) four helical segments B) only b-pleated sheet C) both a-helix and b-pleated sheet D) four cysteine residues which form two disulfide bridges
What supports the claim that current warming trends are caused by anthropogenic activities?
A. It is supported by direct analyses of past climate. B. All natural causes have been disproved. C. It is supported by both direct and proxy evidence. D. All scientists agree definitively. E. It is supported by global climate conference findings.