<span>There are three different cavities, the thoracic, the abdominal and the pelvic cavity. Out of these three cavities the abdominal cavity has no bony protection. The thoracic cavity is protected by your ribs and the pelvic bones protect the pelvic cavity. If you think about your abdominal region its fairly obvious that there are no bones to protect it, the only bones in that area is your spine and that does not protect anything.</span>
A, the endosymbiotic theory tells us that a looooong time ago, when there were only one-cell organisms, they kind of took in a bacteria. They profited from having a bacteria in it ( and I believe it is believed that this made it possible for organisms to have multiple cells, not sure) and these bacteria became mitonchondria/chloroplasts, thus answer A is the only one that doesn't support this theory.
Answer:
A person who studies Natural History
Explanation:
Natural History is the history of organisms. This includes, animals, plants (fungi too) in their natural environment.
Dna polymerase can help prevent errors