Where is the stem cell of an embryo are the instructions located for how to build a heart

No pain is felt, and for one reason or another, the embryonic stem cells would not have been allowed to produce a new life. The benefits of embryonic stem cell research are potentially great. Embryonic stem cells have the capability to differentiate to any tissue in the body, and potentially could eventually be instrumental in cultured organ replacement or gene therapy.

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.