There are a great many animals with more than two legs and a backbone, here are a few examples, cat, dog, cow, goat, pig, horse, zebra, giraffe, elephant, mouse.
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an old man because when it is a baby it walks on 4 legs than it grows up and walks on 2 legs than he gets old an walks on 2 legs and than uses a walking stick so that adds up to 3.
Theoretically if you are taller on average your legs will be longer on average and vice versa if you are shorter. Also but still theoretically if you move longer legs and shorter legs at the same time with the force to scale longer legs will travel more distance in less time than shorter legs. However this is not completely true if you account for the fitness of the person or the fact that the legs will not be moved with a to scale amount of force.
No.But if you are referencing to the riddle, the answer would be "Yes, frogs croak every night."
Yes. Given equal muscular development, a person with long legs will run faster (generally) than a person with short legs, because the stride length will be longer for one movement of the legs.
The pI values for all of the animal insulins would be similar to human insulin (with the exception of chicken and duck) because the amino acid changes all involved neutral amino acids. Chicken insulin would be more basic (because of the histidine substitution) whereas duck would be more acidic (because of the glutamate substitution.)