According to ___________, crossbred animals are generally healthier and grow faster than purebred ones

a. Homogenesis c. Hybrid vigor
b. Superior selection d. Heterogenesis


C

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If a compressed-air tool functions poorly because of low air pressure, the cause is most likely _____.

a. working at too great a distance from the compressor b. an undersized air receiver c. an improperly secured hose or coupling d. a sticky air throttle valve

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Of the nutrients needed by most plants, ____ come from soil

a. three b. twenty c. most d. all

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What is the strongest of all the fabrics made from natural fibers?

a. Cotton c. Wool b. Silk d. Linen

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When the burner shuts off, the pump output pressure drops below 80 psig. This indicates:

A) That the oil nozzle needs changing. B) That the oil filter is clogged. C) Correct operation. D) That the oil pump has a leaky shutoff.

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