Question

In animal phylum first time head formation takes place in

Answer 1

Explanation:

formation of head called Cephalization.

Cephalization is first observed in Phylum Platyhelminthes.

Characteristics of platyhelminthes.

• Body is soft and unsegmented.
• They are triploblastic and exhibit bilateral symmetry.

• The digestive system is incomplete.

• Excretory system consist of protonephridia.
• Respiratory and circulatory system is absent.