Is a small, flexible rod inserted under a person's skin that releases hormones to prevent
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fertilization
The
is worn on a person's outer body and releases hormones to prevent the ovaries from releasing
eggs.
The
is a dome-shaped piece of rubber placed inside the vagina before sexual intercourse.
is worn on the penis to block sperms from entering the vagina.
The
Done

no, because those are both different running competitions. while distance runners train their legs and their lungs to run long amounts of time, the sprinters are training their legs and their lungs to give all they have in the little amount of area they need to cover. the brain also plays a huge part in all of this.

the brain is the only thing in your body that sends messages to your body telling you to run. if you are a long distance runner and you have the mind set of a sprinter, you will not get anywhere. if you have a long distance mind set and you have to run 200m in 20 seconds then you will not make it in time.

answer normal force;