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Thorn of Bougainvillea and tendrils of P...

Thorn of Bougainvillea and tendrils of Pisum sativum represent homology. How?

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The thon of Bougainvillea and the tendrils of Curcurbita and Pisum sativum represent homology. The thorn in former is used as a defence mechanism from grazing animals and the tendrils of latter is used as a support for climbing.
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