​Energy Flow Is One-Way Because ____

Multiple Choice

​Energy flow is one-way because ____.

A) all of the energy in an ecosystem stays constant​
B) ​the amount of energy a producer harvests is equal to the amount of energy consumers consume
C) ​with each energy transfer, some energy escapes as heat
D) ​energy cannot be created but it can be destroyed
E) ​there is only one form of energy