Which of these vascular tissue cells is alive but lacks a nucleus?
A. vessel element
B. tracheid
C. companion cell
D. sieve-tube members
Answer: D
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The red spot on the beak of a herring gull parent is a sign stimulus received by baby gulls
a. True b. False
Angiosperms
a. are the most successful of all plants. b. are the most diverse of all plants. c. are represented by a few heterotrophic plants. d. co-evolved with animal pollinators. e. are all of these.
Of the following, the area that is least likely to be a science is
A. agriculture. B. music. C. medicine. D. aircraft design.
The autonomic nervous system consists of two parts: the sympathetic and parasympathetic divisions. The sympathetic division is responsible for which type of response?
A) Fight-or-flight responses B) Constriction of the air passages in the lungs C) Stimulation of digestion D) Slowing of the heart rate E) Rest-and-digest responses