4. Substitute the following definitions for their one word answers: a. A double layered membranous sac which encloses the heart. b. Blood vessels which connect arteries to veins. c. Tiny openings on the tree bark with intercellular spaces which help in exchange of gases.
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Answer:
- pericardium
- capillaries
- lenticels
Explanation:
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Explanation:
a) pericardium
b) cappilaries
c) lenticles
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