Question

tom uses pesticides to manage his garden. he is: exposing the environment to harmful toxins; causing unnecessary air pollution; saving time and money; conserving water

Explanation:

Pesticides often contain chemicals that are harmful toxins to the environment. They can contaminate soil, water, and harm non - target organisms. They are not directly related to air pollution in the sense described here, nor do they save time and money in an overall sustainable sense, and have no connection to water conservation.

Answer:

exposing the environment to harmful toxins