Arteries
a. are under greater pressure than veins.
b. are thinner than veins.
c. carry blood toward the heart.
d. have valves to prevent backflow.
a. are under greater pressure than veins.
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The pain produced in an internal organ may be
perceived as occurring somewhere else. This phenomenon is called a. mixed nerve messages. b. referred pain. c. phantom pain. d. psychosomatic pain. e. hypochondria.
Which of the following phyla is the most diverse and numerous?
A) The chordates B) The cnidarians C) The echinoderms D) The arthropods
Which of the following conclusions was a results of Mendel's observations?
A.) Organisms that give rise to purebreds are genetically superior. B.) Organisms that have intermediate feature are self-pollinating. C.) Organisms inherit two copies of each gene, one from each parent. D.) Organisms that self-pollinate do not have "either-or" features.
Optimal foraging theory predicts that animals will select
A. food items that maximize their net energy intake per unit of foraging time. B. the most nutritious foods. C. the best times to forage for the most nutritious foods. D. whatever foods are available to avoid traveling too far from their home range.