Blind sac body plan occurs in

Physalia belongs to phylum

Flame cells are found in phylum

_____ is commonly known as hookworm.

Which of the following is bilaterally symmetrical?

Malpighian tubules or coxal glands are organs of excretion found in

_____ is known as living fossil.

The member of second largest phylum is

Excretory system of these molluscs is of open type except

_____ are exclusively marine animals.