Final answer:
Mistletoe extracts water and nutrients from the spruce tree, causing harm to the tree. This is an example of parasitism.
Step-by-step explanation:
b. Mistletoe extracts water and nutrients from the spruce tree to the tree's detriment (loss, disadvantage). This is an example of parasitism, a relationship in which one species benefits at the expense of the other. In this case, the mistletoe benefits while the spruce tree is harmed.