| A. It is a self-sustained unit |
| B. Cyclic exchange of materials between living beings and environment |
| C. Requirement of input of energy |
| D. Characterized by a major vagetation type |
A) A, C
B) A, D
C) A, B, C
D) A, B, C, D
Correct Answer: C
Solution :
Vagetation type is characteristic of biome.
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