The following reaction MgCl2 + NaC2H3O2 -->

a
will occur because both products are aqueous
b
will not occur because both products are aqueous
c
will occur because NaCl is a precipitate
d
will not occur because NaCl is a precipitate
e
will occur because Mg(C2H3O2)2 is a precipitate
f
will not occur because Mg(C2H3O2)2 is a precipitate

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

Iimpact me by the one the yet but him.

The answer is d- principle of faunal succession.

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.