4. Draw a trophic cascade that illustrates why Mao's policy of exterminating sparrows backfired

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project

1) a

2)c

3)a

4)c

5)b

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during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.