Answer:
Aqueduct
Explanation:
An aqueduct was an artificial channel for conveying water, typically in the form of a bridge across a valley or other gap.
<em>Pest resistance occurs when pests (insects, small animals, mites, weeds, and so on) are able to withstand insecticides and thus are not affected. Pest resistance is thought to be a feature of these species. Because of their unique genetic makeup, a small part of the pest population may survive exposure to a pesticide when it is first employed. These people pass on their resistant genes to the following generation.</em>