Which of the following statements best describes an opportunistic infection (oi)?
a.
ois are common only to people with healthy immune systems.
b.
ois are more frequent in the earlier stages of hiv.
c.
ois are the common cause of death of people with hiv/aids.
d.
ois can be deadly to perfectly healthy people.

The majority of sulfur dioxide produced by industry comes from a. oil refineries. b. dry cleaners. c. chemical plants. d. coal-burning power plants.

Match the following terms and definitions. 1. species that are adapted to live in equilibrium at carrying capacity population density 2. population growth that reaches equilibrium and carrying capacity population 3. death rate mortality 4. birth rate k-selected 5. a group of interacting individuals of the same species within the same geographic area natality 6. the number of organisms living in a particular area logistic growth

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin