Question

climate change has many impacts. what is an impact of melting ice caps and glaciers?
changes in temperature bring new agricultural pests.
rainfall patterns are altered in an agricultural community.
deer give birth before food is plentiful in the forest.
water supply is threatened in a mountain valley.

Explanation:

Melting ice caps and glaciers contribute to water - source changes. Mountain valleys often rely on glacier melt for water. The other options are related to general climate - change impacts not directly tied to melting ice caps and glaciers.

Answer:

Water supply is threatened in a mountain valley.