When a unicellular organism like this paramecium eats, the food is stored in the MITOCHONDRIA
The main difference between the organisms are the uses of the appendage and the size and number of certain bones. The human arm is used for a variety of functions while the lizard's and the cat's are used for walking an climbing, the whale's for swimming, the frog's for support and the bird's and the bat's for flying.
It is not c or d. I think it is a.
Background evidence that proves that this hypothesis is plausible
