The blank could be filled in with humerus since it is the longest bone in the leg.
"B" It is based on repeated investigations. It can always be proven false. It might not be, and it is NOT equivalent to a scientific law. A scientific law is something that is true, and nothing could change it. It is a fact.
I hope this helps!
~kaikers
responsiveness to the environment
growth and change
ability to reproduce
have a metabolism and breathe
maintain homeostasis
being made of cells
passing traits onto offspring
H O P E T H I S H E L P E D <3