Question

cranal system in sponges develops
due to​

Answer 1

Answer:

Sponges are among the most primitive of all animals. They are immobile, and live by filtering detritus from the water. They have no brains or, for that matter, any neurons, organs or even tissues

Answer 2

Answer:

folding of inner walls

Explanation:

cranal system in sponges develope due to folding of body wall. Three types of cranal system in sponges are ascon type,sycon type and leucon type of cranal system ismost advanced and develops by folding of body wall . ascon type of cranal system is most primitive and shows minimal folding .

so the correct answer is folding of inner walls