Sodium chloride can be formed by the reaction of sodium metal and chlorine gas. If 45.98g of sodium combines with an excess of chlorine gas to form 116.89g sodium chloride, what mass of chlorine gas is used in the reaction?

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.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

i think it is d. objects resist changes in their state of motion.

not always but somethings can be reproduced in a laboratory.