Here you can see that Daniel and Samuel are gonna have a boxing match
Here the Muscular system and the skeletal system are giving the boxers the ability to move and give them structure. For example if one of them were to throw a punch that would be an example of these to systems working together.
Here the Circulatory and Respiratory system will work together to take in oxygen, deliver nutrients to cells and get rid of waste. They will also move fresh air into your body and get rid of gases in the body. But that's not what they do together when working together they circulate blood and oxygen throughout the body. So when the boxers start to fight they need the blood to move throughout the whole body then they also need the oxygen to be able to breath so most likely they will be using more oxygen when they get tired.
A couple hours before this fight both boxers had something to eat so you might ask what does this have to do with the fight will the digestive system has absorbed the water and nutrients the boxers had before the fight so the digestive system is breaking down the food. Which the respiratory system is also occurring taking in oxygen and getting rid of gases like carbon dioxide.
Here the muscular system is in process when the boxer throws his punch. The skeletal system is also helping the muscular. Then the circulatory is delivering the oxygen.
The nervous system is sending signals to the other systems so they will be able to preform their function/job.