What are some challenges land plants face compared to life in the water?
A) Obtaining and retaining moisture
B) Staying upright against the pull of gravity
C) Obtaining resources from air and soil instead of from water
D) All of the above are challenges faced by land plants.
D
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Testosterone exerts _______ feedback on secretion of luteinizing hormone.
Fill in the blank(s) with the appropriate word(s).
What would be the result of cross-species fertilization between a male lion and a female tiger that produced a "liger"?
a. mechanical isolation b. a sterile hybrid c. an offspring that would not be able to survive d. extinction e. speciation
All of the following are functions of the circulatory system except
A. oxygen, nutrient, and waste transport. B. blood clotting and immune defense. C. creation of red and white blood cells. D. hormone transport. E. temperature regulation.
What is the role of helper T cells in the adaptive immune response?
a. Helper T cells directly kill infected host cells. b. Helper T cells activate B cells and cytotoxic T lymphocytes to kill infected host cells. c. Helper T cells phagocytize bacteria and viruses. d. Helper T cells produce and secrete antibodies.