<p><strong>Noun</strong></p><ul><li>An expert on environmental problems.</li><li>Any person who advocates or works to protect the air, water, animals, plants, and other natural resources from pollution or its effects.</li><li>A person who believes that differences between individuals or groups, especially in moral and intellectual attributes, are predominantly determined by environmental factors, such as surroundings, upbringing, or experience (hereditarian).</li></ul><p><strong>End of Response</strong></p>