Here are just a couple of reasons:
1. Many people don't wash before they go in the pool.
2. People urinate whilst still in the pool.
You can accidentally swallow some of the water.
whenever. it doesn't matter. some people learn at a young age, but people can learn at any age.
people mite not beable to swim or scared they mite sink.
Many people never learn to swim.
You are scared because if you enter water and you can not swim, you could drown. Real people can not become mermaids, that is just for stories.
She can swim but she is to scared to jump off the diving board
You need to wear sun block, or a full suit that blocks UV rays, alternatively you could learn in an indoor pool. I gues you are going to swim in the sea - if so you should check out the full body wet suits that are available.
Fish are born to swim, they learn naturally like we learn how to walk
Most people (that can swim) can swim 400 yards. The speed of how they do that although varies.
People have to be taught to swim. Animals for the most part have the ability to swim instinctively. I believe people have lost some of their instincts as they gained intelligence.
Yes penguins have to learn to swim because if they did not learn how to swim they could not go hunt for food and they would starve and/or drown
most people can't swim
learn how to swim!