Describe the organism that scientists believe was responsible for changing the composition of the early atmosphere. what was it called and how did it change did it change the atmosphere? why was the change to the atmosphere so important?

It was the plants around us. They give us air to breath. It was to help us breath so we can live.

1. when the tempature rises,your sweat glands and then springs into action making perspiration. some sweat evaporates with your skin taling heat with it.2.some of the blood pumped by the heart travels by your lungs to get rid of carbon dioxide and pick up oxygen.3.saliva produces by, you drinking water which saliva is 98% of. when mucus builds up in your body it also creates saliva as well as, antibacterial compunds.4.when the core body tempature drops, the shivering reflex is triggered to maintain homeostasis. for example: when you get out the pool you start to shiver because it is cold.