skeletal system and the muscular system,
Muscles are attached to the skeleton and work assuming that the skeleton is there; for example, there is no muscle that makes sure you don't bend the middle of your arm, as it's stable because there is a bone in it. Basically, the skeleton is a scaffolding for the muscles.
the skeletal system and the nervous system,
Many nerves run along the skeleton, or even inside the bones, and the bones protect the nerves; for example in the spinal cord
the muscular system and the nervous system.
The Nervous system controls the muscles; it sends the muscles commands
In the given situation above, the TCS food in temperature danger zone in four hours or longer should be thrown out for this could provide microorganisms to grow in the food and this could promote spoilage in which it could damage the health of the person who is going to eat the food. It is unhealthy to eat the food given if the situation above is being applied.
They are usually between the ages of teenage and adulthood
You should do this by putting the blood sample in a secure container. Then put it in a bag and label the substance. After this take it to the lab and do what is needed for the experiment.