<span>B. Bacillus
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Bacteria are single celled microorganisms. They have a simple cell structure than other organisms because they have no nucleus and no cell membrane. Their control center containing the genetic information si contained in a single loop of DNA. They are classified into five groups according to their shape; cocci are spherical, bacilli are rod shaped, spirilla are spiral, vibrios are comma and spirochaetes are corkscrew. They can exist as singe cells in pairs, chains or clusters. Rod shaped bacteria are called bacilli.
Answer:
OC
Explanation:
Primary succession begins after a new habitat is opened that was previously unavailable- for example, lava flow that left behind bare rock. This successions normally begins with organisms like lichens, which are able to survive in these conditions. It has no soil and was previously uninhabited.
Secondary succession begins as a response to a disturbance that clears a previously inhabited area, like a forest fire or tsunami. This may cause a lot of destruction and death, but afterwards there is still soil available for new plants to grow again. Eventually, the habitat will regrow itself.