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Which of the following is an example of an active defense

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Which of the following is an example of an active defense
a cuckoo bird’s laying of an egg in the nest of a different species
a porcupine’s quills
a hawk swooping down quickly to capture,kill and eat a prairie king snake
a goldfinch feeding on the seeds of a thistle plant
an antelope’s evasion of a cheetah
Which of the following is an example of an active defense
好像应该是a porcupine’s quills第一个属于巢寄生,第三、四个属于捕食,第五个是被动防御