Yes. Yes.
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Yes, sperm cannot survive once completely dried out. Sperm require a specific environment to remain viable and once dried, they become non-viable.
Yes, sperm can die when exposed to oxygen because oxygen can damage the sperm cells and reduce their viability.
Human sperm would not be able to fertilize a female dog's eggs. The sperm would likely die in the dog's reproductive tract as it is not compatible for reproduction between different species.
Yes, sperm can die when it is washed off hands due to exposure to soap, water, and temperature changes. Washed off sperm is not likely to survive, especially if it is not in a suitable environment to sustain life.
Sperm maturation occurs in the epididymis, a coiled tube located on the back of each testicle. It is here that the sperm acquire motility and the ability to fertilize an egg.
Sperm can survive for a few minutes to a few hours outside of the body, depending on factors like temperature and exposure to air. However, once sperm is washed off and exposed to water or cleaning agents, it will likely die within a few seconds to minutes.