Look at the chemical reaction below. Magnesium + hydrochloric acid -
magnesium chloride + hydrogen
Mg + 2HCI - MgCl2 + H2
In this reaction:
Magnesium (Mg) is a
Hydrogen (H2) is a
magnesium chloride (MgCl2) is a
hydrochloric acid (HCI) is a
DONE

a

Explanation:

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.

c.more precipitation,but only when emission levels.