Question

2. Which of these has a canal system?
O Hydra
O Coral
O
Starfish
O Sycon​

Answer 1

Answer:

Explanation:

Phylum Porifera includes primitive multicellular animals and has cellular level of organisation. They are commonly known as sponges which 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. Sycon is a sponge. Hydra and Adamsia are coelenterates while Echinus is an echinoderm animal.