The teeth designated by the letter “A” in the above
figure are called
a. canines.
b. premolars.
c. incisors.
d. molars.
e. none of these.
Answer: d
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The resolving power of a microscope is described as the ability of the microscope to
A. separate clearly two objects that are very close together. B. magnify an object. C. separate the colors of an organism's internal structure. D. see structures at various depths in a tissue.
Which tissue will conduct sugars and organic molecules throughout the plant?
a. Phloem b. Dermal c. Xylem d. Collenchymas e. Sclerenchyma
________ are the units of muscle contraction. a. Actin b. Myofibrils c. Myosin d. None of these choices
e. Sarcomeres
It is thought by scientists that the earliest living organisms
a. originated on another planet. b. were photosynthetic. c. used carbon monoxide as a carbon source. d. used aerobic respiration. e. made use of sulfur and hydrogen gas as energy sources.