What are some density-dependent factors that affect humans at higher population densities, and how
have these been addressed in industrial societies?
What will be an ideal response?
Competition for all resources increases at high population densities. This leads to an increased
mortality rate. Disease, violence, and famine are some of the factors that worsen at high population
densities. In industrial societies, sanitation has decreased death by disease. Poverty has been addressed
less successfully in industrialized nations and can be viewed as an outcome of competition for
resources. War, too, is almost invariably a result of competition for resources, although fighters are
often recruited using religious or cultural propaganda.
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Which of the following statements characterize heterospory?
_____ It involves production of two different types of spores from a single sporangium. _____ It involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. _____ It increases the chance of cross-fertilization. _____ It increases the potential for genetic variation and aids evolutionary flexibility. _____ It occurs in seed plants and seedless vascular plants.
If an individual had a fractured larynx:a
they would not be able to breathe. b. the lungs would not properly inflate. c. their nose would be crocked. d. the esophagus would be blocked. e. they would be unable to speak
A measure of the average kinetic energy of the molecules making up a substance is known as
A. temperature. B. heat. C. potential. D. phase of matter.
Which of the following statements best describes the true nature of natural selection?
A) Only the strongest survive. B) The strong eliminate the weak in the race for survival. C) Organisms change by random chance. D) Heritable traits that promote reproduction become more frequent in a population from one generation to the next.