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.
Stromatolites exhibit a variety of forms and structures, or morphologies, including conical, stratiform, branching, domal, and columnar types. Stromatolites occur widely in the fossil record of the Precambrian, but are rare today. Very few ancient stromatolites contain fossilized microbes.