Fish don't really have hands so they have to use their mouth.
The results will most likely be valid because the scientists kept getting the same results after REPEATED experiments. If they just conducted one experiment then they would not have been sure if what happened was a fluke or if another thing would happen after another experiment.<span />
The answer to your question (I BELIEVE) is true.
Answer:
The bones of skeletal system serve to protect the body's organs and support the weight of the of the body ,giving the body it's shape
Explanation:
The muscles of the muscular system attach to these bones, pulling on them to allow for movement of the body
Since an animal only becomes more complex, and not simpler, an ancestor to all organisms would have to be the most simple and primitive organism.
