The blood pressure is lowest in the _____
A) aorta
B) arteries
C) arterioles
D) left ventricle of the heart
E) vena cava
Answer: E
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Which invertebrate has an endoskeleton
a. clams b. lobsters c. sea stars d. earthworms e. shrimp
Ecologist Robert MacArthur observed that five species of similar warblers coexisted on spruce trees because they
A. ate different kinds of insects. B. were actually subspecies of the same species. C. cooperated in their foraging habits. D. were kept below the carrying capacity by predators. E. foraged in different places of the tree canopy.
The countervailing forces model:
A) depicts business as operating within a market environment, responding primarily to powerful economic forces. B) depicts the BGS relationship as a flow of interactions among the major elements of society. C) shows the corporation at the center of an array of mutual relationships with persons, groups, and entities called stakeholders. D) is depicted in a pyramidal, hierarchical image of society which primarily represents the perspective of business critics.
What is the difference between the heartwood and sapwood of a tree?
A) Heartwood contains xylem, and sapwood contains phloem. B) Sapwood contains xylem, and heartwood contains phloem. C) Heartwood no longer transports water and minerals, and sapwood still conducts xylem sap. D) Heartwood contains old phloem that no longer functions, and sapwood contains functioning phloem.