During ecological succession, the species composition of a plant community generally
A) changes from a diverse community in which many plants are common to one in which a few species are numerically dominant.
B) remains stable as long as climate and human interference remain constant.
C) changes gradually because each species responds differently to the changing environment.
D) changes until forest is established and a single species of plant remains.
Answer: C
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Answer the following statement true (T) or false (F)
For a given population, life history pattern
focuses on aspects such as
a. number of breeding events. b. availability of resources. c. climatic conditions. d. quality of habitat. e. all of these
Donating blood in the United States
A) requires that the donor be at least age 17. B) does not involve a physical examination. C) though beneficial, may take several hours to complete. D) depends on donors with no prior sexual history. E) is easy and painless, and many donors are allowed to give 5 to 10 units at a time.
According to the progressive hypothesis, viruses may have originated as mobile genetic
elements such as: a. mRNA. b. alleles. c. plasmids. d. enzymes. e. ribosomes.