The important role of the atmosphere is to supply oxygen, water, carbon dioxide and nutrients. It also protects all living things from extreme temperatures and radiation (protects us from harmful solar rays).
Answer:
Although these two may seem somewhat similar, in the broad view, they are two highly different terms.
Mutualism is the <u>equally-beneficial</u> state of the relationship between two organisms. This involves both of the organisms getting their needs sufficed and maintaining a healthy relationship.
Ex. Bee receiving nectar - Flower getting pollinated.
(Hint: <u>Mutual</u>ism - Mutually/equally good for both.)
Parasitism is the <u>solo-beneficial</u> state of the relationship between two organisms. This involves only one of the organisms getting their needs sufficed, thus hurting the other organism in the process.
Ex. A flea gets food, shelter, and protection. - Dog feeling itchy, getting blood drawn from themself, and weakening their immune system to foreign substances.
(Hint: <u>Parasit</u>ism - One organism acts like a "parasite" to another.)
