The evolutionary process that is not happening in the scenario mentioned is Hybridization.
<h3>What do you mean by Hybridization?</h3>
A method via which species can mate with every other and bring fertile offspring hence growing a brand new species is known as Hybridization.
This is not always going on with the two palm species on the island. This can be because of prezygotic boundaries that prevent those species from mating and generating a zygote (fertilized egg cell).
Therefore, In essence, those boundaries prevent any gene glide among the two species.
Learn more about Hybridization here:
brainly.com/question/14447584
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because they used drums for ceremonial purposes.
