Your friend is trying to tell you that human teeth are not alive. You disagree. Why would you say that a tooth in an adult is alive?
What will be an ideal response?
A tooth is partly made up of living tissues because it has blood vessels and nerves as well as a connective tissue called cementum. Damage to the tooth can cause serious pain because nerves are present.
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Why aren't insect tracheae associated with capillary beds?
A. Insect capillaries are found only around the gut. B. Insects have an open circulatory system. C. Insects have external gills associated with hemolymph vessels. D. Insects use an air sac respiratory system.
What is the current situation regarding the
wheat stem rust fungus?
a. it has been eradicated b. it has wiped out most of the wheat around the world c. resistant wheat strains have made the fungus mostly ineffectual d. a new strain of wheat stem rust has emerged that is infecting resistant varieties of wheat e. it is only a problem in the United States
The variable region of a light chain is indicated
by a. A. b. B. c. C. d. D. e. E.
If you see moss near the base of a tree in your yard, the green leafy moss plants are
A) gametophytes. B) gametes. C) sporophytes. D) zygotes. E) spores.