1 Check to see if your community college offers college-level psychology courses for high school students. 2  Enroll in science, math and humanities courses. 3  Consider starting a psychology club at your school.  Look for volunteer opportunities in your community.
play Oxygen enters the atmosphere. Stromatolites pump oxygen into the early atmosphere. Dr Iain Stewart explains how stromatolites, one of the earliest forms of life, first released oxygen over three billion years ago when they turned sunlight into energy.Oxygen was initially soaked up by iron in the seas but eventually entered the atmosphere.arly life affected the structure of the planet. Presenter Aubrey Manning and geologist Professor Maarten De Wit investigate iron rich rocks known as banded iron formations, which formed when stromatolites, some of the earliest known life forms on Earth, produced oxygen that combined with iron dissolved in the oceans.
Function [edit]. The Heme group gives myoglobin and hemoglobin the ability to bind oxygen because of the presence of iron atom. It also contributes to the red color found in muscles and blood. Each heme group contains an iron atom that is able to bind to one oxygen (O2) molecule. Each hemoglobin protein can bind four oxygen molecules. The iron atom, usually in the ferrous oxidation state (Fe), lies between four pyrrole rings but slightly bends away from the plane (0.4 Angstrom from the plane).