Read the following Assertion and Reason and choose the correct option. Assertion: Sponges have a water transport or canal system Reason: They are generally marine and have a cellular level of organism

Step-by-step solution

Sponges have a water transport or canal system. Water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum. This pathway of water transport is helpful in food gathering, respiratory exchange and removal of waste.