Question

A marine biologist observed an organism. It had openings on its body through which food particles and water passed. Which phylum does the organism belong to?

Cnidaria

Porifera

Platyhelminthes

Answer 1

The answer is Porifera.
porifera are the most basic sea organisms that only have openings for food and water.

Answer 2

Answer:

Porifera

Explanation:

Poriferans such as sponges are 'pore-bearing' animals. There are tiny pores called ostia present around the body.  They are primitive animals in which tissues are not formed. Through the ostia water entered into the poriferans.  The collar cells present in the walls of poriferans capture tiny bits of food which is entered along with water.