Describe three ways in which the organs of the circulatory system and respiratory system are protected.

The circulatory system and respiratory system are protected by your skin, muscles, and ribs.

In the respiratory system, your lungs are protected by your ribs. In the circulatory system, your veins are protected by skin I believe. 

B] nitrogen fixationmight be wrong, so correct me.want extra on your answers? just go on my account and go on questions and answer, or ask in the comments!

Give me the statements