Systems Encountered in Nature at Earth's Surface,such as a Forest,are

Multiple Choice

Systems encountered in nature at Earth's surface,such as a forest,are

A) open systems in terms of energy.
B) closed systems in terms of energy.
C) open systems in terms of matter.
D) both open systems in terms of energy and open systems in terms of matter.
E) both closed systems in terms of energy and open systems in terms of matter.