The outer layer of skin is mostly __________
epithelium.
a. simple squamous
b. simple cuboidal
c. stratified squamous
d. simple columnar
e. stratified cuboidal
Answer: c
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Which of the following describes a deciduous conifer?
a. It drops all its leaves at once in autumn. b. It is pollinated by both beetles and birds. c. It grows new pine cones every six months. d. It has flowers that go dormant in winter.
Almost all organisms alive today evolved from marine creatures alive at the beginning of the
A. Precambrian time. B. Paleozoic era. C. Jurassic period. D. Cenozoic era.
Root hairs are similar to mycorrhizae in that both
a. are multicellular. b. are extensions of root epidermal cells. c. are symbiotic relationships involving root cells. d. increase the surface area available for absorption. e. fit all of these descriptions.
Which of the following is an important vasodilator in coronary arteries?
A) adenosine B) nitric oxide C) endothelin-1 D) oxygen E) bradykinin