Your insides produce small needles of minerals, called spicules or sclerites, and these enable you do deter predators enough to become long living and successful.
You are still soft enough to wave in the ocean currents though, and you are known as 'soft corals'. You come in many colours and are found all over the world.
Evolution starts with the Last Universal Ancestor.
You can find out what happened before evolution here.
You can also short-cut to Land plants, or Animals
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