Talk:Coral/@comment-34690515-20180214003255/@comment-45358590-20200401090309

they are made of polyps that are formed in a group. but to grow, they cannot make their own energy so they keep tiny bits of algae inside them to do photosynthesis for the corals so they can grow.

so it makes them a sort of interaction between flora and fauna.

and that makes coral part flora and part fauna and you can't classify them in either classification.

so they have their own classification: coral.