Answer:
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A link between the skeletal system and the muscular system are tendons, which connect bones to muscles.
A link between the skeletal system and the nervous system is how the vertebrae are linked to the nerves in the spinal cord.
A link between the muscular system and the nervous system is how muscles respond when nerves signal them to after responding to the stimulus and traveling to the brain and back.
This is really a subjective answer. If given the choice to either give the lung to a six-year old lung cancer patient or the heavy smoker, I would choose the six-year old.
If I had to choose between car crash victim on a lung machine or the heavy smoker, I would choose the car crash victim.
If I had to choose between this heavy smoker and a young smoker that developed lung cancer, I would choose the young smoker and hope that he/she would change his/her habits and quit.
I bet you're starting to see the point I'm making. Hope this helps!
Twins can either be Mono-zygotic (Identical) Which means they develop from one zygote which splits and forms two embryos, or Di-zygotic (fraternal) meaning that each twin develops from two different eggs and each egg is fertilized by a different sperm cell.
I am not sure which one may be your answer.
But
I Hope This Helped!
I think option three is most realistic, someone correct me if I'm wrong.
Hope this helps :)