Organisms, like bacteria or lichen, that can live on bare rock and form soil are called Pioneer species. In primary succession pioneer species like lichen, algae, bacteria , fungi as well as other abiotic factors like water and wind, start to normalize the habitat. This type of successions begins on rock formations, such as mountains or volcanoes, or in a place with no organisms or soil.
Charles Darwin was B. A Naturalist on the Beagle voyage to South America. A naturalist observes and collects plant, animal, rock, and fossil specimens.
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Extension: Produced by the sartorius and quadriceps femoris group of muscles. Flexion: Produced by the biceps femoris, semitendinosus, and semimembranosus muscles. The popliteus muscle facilitates this movement by unlocking the fully extended knee joint.
