Which of the following is an example of a negative feedback loop?
A. Grass begins to grow on a recently plowed field.
B. Locusts begin to swarm, and when they encounter other non-swarming locusts, they too being to swarm.
C. A small island is home to both wolves and deer. When the deer have high numbers, the wolves have plenty of prey to feed pups and their numbers increase. When the deer are heavily predated upon, the deer numbers decrease causing some of the wolves to starve.
D. A person is driving and is cut off by another driver, this causes the person to become angry and they begin to drive more aggressively, cutting off other drivers.
Answer: C
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In this part of the Periodic Table, what type of elements are in the group that includes elements He, Ne, and Ar?
A. noble gases B. silicates C. metals D. nonmetals
Truck farming is a term that derives from the Middle-English word truck, meaning
A) "cart." B) "mobility" or "movement." C) "subsiding" as in "subsistence agriculture." D) "bartering" or "exchange of commodities." E) "horse" or "horse-drawn."
A plant that is unable to extract needed water from soil has reached its
A) field capacity. B) permeability. C) wilting point. D) porosity.
Egypt has a low population density of 71 people per square kilometer. Why is this figure deceptive?
A) Most of the people temporarily leave for jobs in surrounding countries during harvest time. B) Much of its population is in refugee camps along the coast. C) The population migrates seasonally within the country, occupying the highlands in the summer. D) Almost all the people are in the Nile Valley where densities are extremely high. E) Most of the people are in urban areas, which are not used when calculating population density.