Which of the following statements is true? Opportunistic bacteria only cause infection under certain conditions. Most bacterial infections are caused by bacteria already in the body. The flu and the common cold are treated with rest, fluids, and antibiotics. Leukocytes are the first line of defense against pathogenic microorganisms.

Adistinctive characteristic of mammals that is not observed in other vertebrates is

All other things being equal the size of a population will decrease if

Two pea plants with yellow peas are crossed. most of their offspring have yellow peas, but about 25 percent of the offspring have green peas. for pea color, yellow is the dominant trait and green is the recessive trait. what does this tell you about the two parent plants? a. the parent plants have only dominant alleles for pea color. b. the parent plants are heterozygous for pea color. c. pea color follows an incomplete dominance pattern of inheritance. d. the parent plants are homozygous for pea color.