How does the digestive process in cnidarians differ from sponges?

Explanation:

digestive process in cnidarians differ from sponges

1. i) sponges have intracellular digestive system.

 ii). They feed on planktons by filtering water.  

 iii). Digestion takes place completely in choanocyte cells.

Cnidarians

1. i) Cnidarians are predators and feed on small fish, krill and many small species.

ii )All cnidarians are carnivores and have very simple body structures adapted as predators.

 iii) Cnidarians carry out extracellular digestion. Enzymes break out the food into small particles. Cnidarians have an incomplete digestive system and have only one opening.

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the answer to your question is:

c. complementary base-pairing