Why do islands have so many coconut trees on them?

Answering for most tropical islands : Coconut seeds are dispersed by water when the outer layers dry out, carrying the seeds over great distances till they find soil. read more

Coconut trees prefer sandy soils and abundant sunlight, a feature of most tropical islands. Thus, most islands provide the perfect conditions for the coconut plants to germinate, survive, and thrive, which is why many coconut plants are observed there. read more

Many aquatic plants and plants that live near water have seeds that can float, and are carried by water. Plants living along streams and rivers have seeds that float downstream, and therefore become germinate at new sites. The size of the seed is not a factor in determining whether or not a seed can float. read more

Coconut trees lean towards the sea so their seeds can fall into the sea more easily. Coconuts are able to float over long distances which allows coconut trees to grow on very remote island shores. Another reason they lean towards the sea is because the leaves will have more access to light. read more