The canal system in sponges develops due to
Q. The canal system in sponges develops due to
A. Porous walls
B. Gastrovascular system
C. Reproduction
D. Folding of inner walls
Answer: Folding of inner walls
A. Porous walls
B. Gastrovascular system
C. Reproduction
D. Folding of inner walls
Answer: Folding of inner walls