Which of the following statements about human impact on trees is true?
a. human activity always has a negative impact on trees.
b. all human uses of trees require destruction of the trees.
c. human activity has had both a positive and negative impact on trees.
d. cutting down trees is the only activity that has a negative impact on trees.

c. human activity has had both a positive and negative impact on trees

Explanation:

The effect of human activity on trees can be either positive or negative depending on the sort of activity the human performs on trees. For example, if someone notices that trees are being affected by a plague and he / she applies some pesticide , this will probably avoid  the trees from dying. Therefore, this  has a positive impact. On the contrary, if someone cuts down trees, this will certainly have a negative impact.

b

explanation:

c. in order of atomic number