Both prokaryote and eukaryote cells have this structure. it maintain homeostasis and is a boundary between the inside of the cell and the outside environment. it is the
a) nucleus.
b) membrane.
c) cytoplasm.
d) cell wall.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

hammurabi rulers

good lesson