The most amount of energy is available to
a. A.
b. B.
c. C.
d. D.
e. E.
A
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Natural killer cells specifically kill which of the following?
A. Foreign transplanted tissue B. Tumor cells and cells infected by microorganisms C. Gram-positive bacteria D. Fungi and protozoa
Which of these is not a required characteristic of life?
A. evolution B. structural organization C. energy use D. homeostasis E. movement
The major difference between the human male and
female reproductive systems is the a. provision of a site for fertilization and embryo development in the female. b. production of haploid gametes only by the male. c. diploid polar bodies of the female. d. generation of millions of eggs but only thousands of sperm each month. e. presence of a duct system opening to the body’s exterior only in females.
Which area of the United States experiences rainfall with the lowest pH?
a. southwest b. southeast c. northeast d. Midwest e. northwest