________ is/are biodegradable and known to have (a) short persistence time(s)
A) DDE B) Bt C) DDT D) PBDEs E) PCBs
B
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A population in which the total fertility rate is 2 means that
A) birth rates and death rates are roughly equal. B) the population is neither increasing nor decreasing. C) the population will double in about 40 years. D) the population will decline by half in 40 years. E) both the birth rates and death rates are roughly equal and the population is neither increasing nor decreasing.
If Earth suddenly cooled and temperatures decreased, what issue would you expect to see in some turtle populations?
A. More turtles with thin shells. B. More turtles with thick shells. C. A decrease in the number of male turtles and an increase in the number of female turtles. D. A decrease in the number of female turtles and an increase in the number of male turtles.
Which of these South Asian cultures is the oldest?
A) Harappan B) Mughal C) Aryan D) Vedic E) Parsee
If new seafloor is being created at spreading centers, why don't we find a lot of old oceanic crust on the surface of the Earth? Because oceanic crust is being ____ where it collides with continental plates.
A) folded B) pushed up C) subducted D) vaporized