C) Producers convert light energy into chemical energy.
From eating food. because without food no body's can live
In DNA there are two types of strands, 5'/5 prime, which is the strand, aka the leading strand.
There is also the 3' strand which is the lagging strand.
The difference between these two is the the leading strand is discontinous during replication, they must create ozaki fragments.
The other lagging strand can just have the whole strand replicated at the same time
In fish, the heart only has one atrium and one ventricle. The oxygen-depleted blood that returns from the body enters the atrium, and then the ventricle, and is then pumped out to the gills where the blood is oxygenated, and then it continues through the rest of the body.
B). Valence Electrons only, as two or more chemials bond the Valence electrons jump from chemical to chemical or the share the electrons to form a bond