Answer the following question given this paragraph: 

Two horrific contraptions on frictionless wheels are compressing a spring by compared to its uncompressed (equilibrium) length. Each of the vehicles is stationary and they are connected by a string. The string is cut! Find the speeds of the vehicles once they lose contact with the spring.


Q: Transport of nutrients and regulation of body temperature through fluid flow are characteristics of which bodily system?


A:
cardiovascular