8. How does the bonding a ligand to its receptor transduce the message? It causes the protein to

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.

the correct answer would be 6 feet.

compost can be added to topsoil as a:

pesticide

the answer is c. it will give up it's valence electron to the other atom.