Which of the following is a boring sponge?

$A$ chamber common to all types of canal systems of sponges is called:

Which of the following is an asexual reproductive method in sponges?

Which phylum consists entirely of aquatic animals?

Body having meshwork of cells,internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of Phylum

Which of the following are 'multicellular grade' organisms?