Question

occurs when the environment is tainted with the by-products of human actions
choose
contract
intrastate commerce
conditions of work
property tax
conservation
interstate commerce
copyright
pollution
sales tax
patent

Explanation:

Pollution is defined as the introduction of contaminants into the natural environment that cause adverse change. The key phrase "environment is tainted with the by - products of human actions" aligns with the concept of pollution. A contract is a legal agreement, intrastate commerce is trade within a state, conditions of work relate to employment, property tax is a tax on property, conservation is about protecting resources, interstate commerce is trade between states, copyright is about intellectual property, sales tax is a tax on sales, and patent is also about intellectual property. None of these other terms match the description as well as pollution.

Answer:

pollution