Solution:
Platyhelminthes includes triploblastic, bilaterally symmetrical acoelomates.
Cnidarians and ctenophores are diploblastic and radially symmetrical.
Sponges are mostly asymmetrical; some are radially symmetrical.
Animals of which of the following phyla are triploblastic and bilaterally symmetrical?
Platyhelminthes includes triploblastic, bilaterally symmetrical acoelomates.
Cnidarians and ctenophores are diploblastic and radially symmetrical.
Sponges are mostly asymmetrical; some are radially symmetrical.