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.
There are two main categories of animals: vertebrates and invertebrates. Vertebrates have a backbone and include mammals, birds, reptiles, amphibians, and fish. Invertebrates do not have a backbone and include insects, arachnids, mollusks, and crustaceans.
The force and speed of wind will determine how little and big the waves are.
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Clouds can vary in size from a few meters to several kilometers. Factors that determine a cloud's size include the amount of water vapor present, temperature, and air pressure.
The biggest size of river fish.
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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.
Lightning can vary in size, but on average it is about one inch in diameter. Factors that determine the size of lightning include the amount of electrical charge in the cloud, the distance the lightning travels, and the atmospheric conditions.
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.