Plants do not have a circulatory system like that of some animals. If a water molecule in a plant did "circulate" (that is, go from one point in a plant to another and back in the same day), it would require the activity of _____
A) only the xylem
B) only the phloem
C) only the endodermis
D) both the xylem and the phloem
D
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Four of the following are extraembryonic membranes of the amniote egg. Which one is the exception?
a. albumen b. amnion c. chorion d. allantois e. yolk sac
A study of a cohort of 1,000 animals showed a 90 percent death rate per individual in the first year, 10 percent the
second year, and 5 percent the third year. This population's survivorship is _____. a. type I b. type II c. type III d. type I the first year and type II in years two and three e. type I the first year, type II the second year, and type III the third year
Seriously abnormal phenotypes or harmful mutations are acted against or reduced to low frequenciesby:a
beneficial mutations. b. gene flow. c. disruptive selection. d. genetic drift. e. natural selection.
Individuals can have MRSA as part of their normal flora or microbiota
a. true b. false