Question

What are the uses of openings on the body of poriferans?

Answer 1

Answer:

it is used for the entering food from the see and also for the movement of water inside their whole body in order to circulate the nutrients to the body parts

Answer 2

So, they maintain a constant water flow through their bodies to obtain food and oxygen and to remove wastes. This is called the water canal system and is achieved with the help of many holes or pores on their body called ostia.