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The withdrawal method, or when the male "pulls out" of the female before ejaculation, is notoriously unreliable. Before ejaculation occurs, a small amount of semen, also known as "pre-cum," leaves the penis. There is some debate as to whether this fluid contains sperm cells.

The cartilage allows for growth and enlargement of the model. It is gradually converted into bone over time. Discuss the development of the vertebrae, ribs, and sternum. The vertebrae, ribs, and sternum all develop via the process of endochondral ossification.