David is a research scientist who is giving a lecture to a class of students on how life began on Earth. Help him complete the s
entences. Scientists have found
containing fossilized cyanobacteria (blue-green algae). They show that life has been present on the Earth from early ages. Oparin and Haldane were two scientists who hypothesized that life needed reducing environments initially to appear. The ocean in the early ages was
(devoid of oxygen) and acidic.
"Scientists have found containing fossilized cyanobacteria (blue-green algae). They show that life has been present on the Earth from early ages. Oparin and Haldane were two scientists who hypothesized that life needed reducing environments initially to appear. The ocean in the early ages was (devoid of oxygen) and acidic."
However, the cyanobacteria produced oxygen as a waste product, as cyanobacteria are photosynthetic. This eventually lead to the Great Oxygenation Event, as this nearly killed off the cyanobacteria as a whole. Although, a few plants at this time used oxygen in their own metabolic processes. This allowed these plants to grow and breed faster. This lead to today, where the majority of multi-cellular life on Earth started from these oxygen-sucking plants, not the cyanobacteria.
An energy resource with a low or negative net energy can have a hard time competing in the marketplace with other energy alternatives that have medium to high net energy yields unless it receives financial support from the government (taxpayers) or other outside sources.
El calentamiento global causa que el nivel del mar se eleve, debido a que el hielo en las plataformas continentales se derrite y que el agua del océano se expande al calentarse.
It was the famous Theodor Escherich who is a famous German bacteriologist that discovered the E. coli and was also known for his research in the area of protein synthesis. In addition to that, Theodor Escherich discovered the bacteria type when he examined its samples from a patient suffering from gastroenteritis.
