Which of the Following Is True with Respect to Air,water,and

question 60

Multiple Choice

Which of the following is true with respect to air,water,and material resources?

• A)A forest is a closed system.
• B)A forest is an open system.
• C)A forest is an open system in terms of air,but closed in terms of material resources.
• D)A forest is an open system in terms of water,but closed in terms of energy resources.