Men rarely become infected with Trichomonas vaginalis because the male reproductive tract lacks the appropriate receptors and has a pH unfavorable for Trichomonas.
Answer the following statement true (T) or false (F)
False
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In the absence of predators, what do you think was the main selection factor affecting the average number of spots on male guppies?
a. an infectious disease that influenced pigment deposition in guppy integument b. sexual selection by females for males with high spot numbers c. a completely random process d. none of the above
Which phase of development occurs just prior to the postnatal period?
a. zygote b. embryo c. fetus d. neonate e. infancy
Which of the following examples is best explained by the process of convergent evolution?
A. The wings of birds and butterflies being used for flight. B. Wolves and coyotes both producing milk for their young. C. Both mice and rats having a tail. D. A human cell and a fruit fly cell both going through the process of transcription and translation in order to produce a gene.
The human disease filariasis is caused by worms from which phylum?
a. Mollusca b. Cnidaria c. Nematoda d. Platyhelminthes e. Annelida