There are many creatures living in the ocean, both plants and animals, some of which are difficult to distinguish whether they are animals or plants only from the appearance. For example, coral is a kind of creature in the ocean. From the appearance point of view, their colors are very bright, and the overall color of coral clumps is even more beautiful. They don't seem to move, and their shape is more like a coral Bush, so many people will think that coral is a plant.
In fact, coral is not a plant, but an animal. In terms of category, coral is an invertebrate, belonging to one of the lower animals. Specifically, they belong to coelenterates, and their body structure is naturally very simple compared with vertebrates such as fish and mammals, consisting of only two embryonic layers. They also have mouths, through which they feed, but they have no special excretory structure, and if the food they eat is not digested, it will come out of their mouths. They have tentacles around their mouths, which they can use to catch prey and put the prey into their mouths.
As mentioned above, corals are animals, so they also have life. Although they are relatively inferior creatures, they can also carry out life activities like higher animals. For example, they will use their tentacles to hunt and put food into their mouths. They also digest the food they eat, and if some food is not digested and absorbed, they will pass it out of the body.
