does the backbone determined the size of animal
No
No.
The backbone determines how big an animal will get because normally in most animals the width of the animals back bone will not change much in size.
The force and speed of wind will determine how little and big the waves are.
a big fat sloppy dick that likes to orgasum
you cannot determine the size of your penis by the amount of pubes you have.
Cost. Size of the room it is going in. Smaller room will be overwhelmed with too big a unit. Size of the furnature it is going to sit in or on.
The biggest size of river fish.
a coral reef is not one big animal, it is a bunch of small coral polyps growing on top of each other. the outer layer are the live polyps (coral is an animal) and they are on top of the dead coral skeletons. a coral polyp does not have a backbone because it is an invertebrate of cnidaria phylum. it has a skeleton made of calcium carbonate, or carbon and calcium. neither one coral polyp has a backbone and a coral reef does not have a backbone either.
We can determine how big it was and what it looked like. We can determine what they ate. By knowing where the bones were found, we know when and where they lived. We can potentially figure out how they animal died. We can estimate how the animal probably moved in life. Those are just the basics.
because the pig is a reasonably big animal, its brain is around the same size as a humans
A rattlesnake could kill an animal the size of a horse or cow. However, it could not eat such a large animal. Its bite would be in self defense.