The giraffes have got stiff necks because
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Answer:
To eat the leaves of tall trees.
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Hope my answer is helpful
Explanation:
The latest theory – and it's a surprise this hasn't come up before, given biologists' fixation with it – is that the long necks are the result of sexual selection: that is, they evolved in males as a way of competing for females. Male giraffes fight for females by “necking”.
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