Which of the following is an example of an open system?
a) an aquarium with both plants and animals
b) an enzyme found in deep ocean organisms that allows them to glow
c) a living single-celled organism such as phytoplankton
d) a river that has been dammed

Here is your answer:                                                                                                                                                                                                                                                   formula for volume: base*width*height=                                                                                                 5*2*10=100                                                                                   your answer is 100cm.