Which Statement Best Describes a Key Difference Between Movement of Energy

Which statement best describes a key difference between movement of energy and movement of nutrients through an ecosystem?

A) Nutrients always move rapidly through an ecosystem; energy always moves slowly.
B) The same energy is used over and over; nutrients move through a system and do not return.
C) The same nutrients are used over and over; energy moves through a system, and some is lost as heat.
D) The amount of energy determines the amount of production that can occur; the amount of nutrients is not relevant.
E) The amount of nutrients determines the amount of production that can occur; the amount of energy is not relevant.