Question

_________ do not have a backbone , while __________ have it.
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Answer 1

Answer:

uncountable noun [oft with brd-neg] If you say that someone has no backbone, you think that they do not have the courage to do things which need to be done. You might be taking drastic measures and you've got to have the backbone to do that.

Explanation:

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Answer 2

Answer:

__invertebrates_do not have a backbone , while __vertebrates_ have it.

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