Even-aged management practices involves clearing trees that
a. are all the same height
b. are all the same weight
c. are all near the same age
d. are all of widely different ages

The answer is d. are all of widely different ages

Even-aged management practices involve those practices necessary to achieve a cohort group of trees. The cohort group of trees includes those trees that are all near the same age. So, to achieve this, trees of widely different ages must be cleared, living only trees that are all near the same age (of the same cohort group).

Heatamount of salt . . .