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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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.
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
Individuals can have MRSA as part of their normal flora or microbiota
a. true b. false