Vertical transmission involves
A. droplet transmission.
B. fomites.
C. pasteurization.
D. pregnant woman to fetus.
D
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Sphincters
a. are circular muscles. b. prevent backflow. c. are smooth muscles. d. are found at the entrance and exit of the stomach. e. include all of these
Males never give an X chromosome to any of their sons
a. True b. False
Which of the following statements regarding food webs is true?
A) A consumer may eat only one type of producer. B) Detritivores consume dead organic matter from a specific trophic level. C) Several species of primary consumers may feed on the same species of producer. D) Nutrient transfer moves from producer to consumer and back. E) A hawk at the top of the food web is only a quaternary producer.
Which of the following is a component of phloem?
A. Tracheids B. Sclerenchyma cells C. Epidermal cells D. Cork cambium E. Collenchyma cells