Which of the following statements concerning the heart is false?
a. It is an organ.
b. It contains endothelium.
c. It contains nerves.
d. It is an organ system.
e. It contains smooth muscle.
D
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The natural antibodies in serum that react with A or B polysaccharide antigens are mostly of the class
A. IgG. B. IgE. C. IgM. D. IgD. E. IgA.
Two boys are on a camping trip and need birch bark to start their cooking fire. They cleanly remove a six-inch strip of bark from around the entire circumference of the trunk. Explain what eventually will happen to this tree
What will be an ideal response?
The symptoms and signs of Luft’s Syndrome include
all of the following EXCEPT a. high oxygen consumption. b. constant fever. c. flushed skin. d. abnormally shaped mitochondria. e. low number of mitochondria
Why are gymnosperms considered to be "naked seed" plants?
A) Their seeds have a thin layer of endosperm. B) They do not produce seeds; they produce only spores. C) Their seeds are not enclosed within ovaries. D) Their seeds develop on the surface of sporophytes.