A pheromone is a ________
A) strong herbicide
B) predator used to manage a pest naturally
C) species-specific chemical attractant
D) chemical that travels in the bloodstream and controls an organism's growth and development
E) new form of chemical insecticide waiting FDA approval
C
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In a common DC circuit, electrons move at the speed of
A) a fraction of a centimeter per second. B) many centimeters per second. C) a sound wave. D) light. E) none of the above
A(n) ____________ ____________ is a physical or biological necessity whose presence in inappropriate amounts
limits the normal action of an organism. Fill in the blank(s) with the appropriate word(s).
Singapore is a small country with about 5 million people, so the entire country falls within urban areas
Indicate whether the statement is true or false
Hail forms:
A) during the coldest time of year because it is the largest form of precipitation. B) as a result of added uplift over mountains. C) during the warmest time of the year because this is when the thunderstorm updrafts are strongest. D) only in the summer and early fall.