They need to Exercise routinely.
Answer:Stenosis is the term for a valve that is narrowed and doesn't open properly.
Explanation:The flaps of a valve may thicken, stiffen or fuse together. As a result, the valve cannot fully open. The heart then has to work harder to pump blood through the valve, and the body may suffer from a reduced supply of oxygen.
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Upbringing should be the answer
Therapeutic cloning is achieved by creating embryonic stem cells in the hopes of treating diseases such as diabetes and Alzheimer's. The process begins by removing the nucleus (containing the DNA) from an egg cell and inserting a nucleus from the adult cell to be cloned. -wikipedia