Which of the following statements does NOT describe an attribute of conifer resin?
A. It hardens on contact with air.
B. It forms amber.
C. It traps insects and other organisms.
D. It is an antibiotic and prevents infections.
E. It flows through ducts in the wood and leaves.
D. It is an antibiotic and prevents infections.
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Which of the following describes the curve labeled “E” on the graph?
a. a primary response to the initial antigen b. a secondary response to the initial antigen c. a primary response to an antigen distinctly different from the initial antigen d. a secondary response to an antigen distinctly different from the initial antigen e. a tertiary response to the initial antigen
Breathing rates are automatically increased when _____ levels are _____
a. oxygen; high b. carbon dioxide; high
c. oxygen; low d. carbon dioxide; low e. ATP; low
Rings of muscle in the digestive tract that can open and close, regulating the movement of food into or out of parts of the digestive system, are
A. rumens. B. sphincters. C. chymes. D. villi. E. uvulas.
The sieve plate, stone canal, circular canal, and radial canals of a sea star are structures of the
a. nervous system. b. water-vascular system. c. digestive system. d. excretory system.