Question

Compare these groups based on coelom and segmentation, porifera, platyhelminthes, nematoda, annelida

Answer 1

Porifera:  

• Absence of body cavity and hence coelom is not present
• There is no Segmentation present

Platyhelminthes:

• Absence of coelom.
• There is no Segmentation present

Nematoda:

• Absence of a true coelom.
• There is no Segmentation present

Annelida:

• A cavity made up of fluid forms the coelom between the outer body wall and the gut.
• Segmentation is present which divides the bodyinto a wall-like septum.

Only group Annelida has coelom and segmentation while the other groups don't.

Answer 2

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