Que son las bases nitrogenas con se llama cada una de ellas y que función tienen en él ADN ?
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What are the most explosive events that occur on the sun? umbras solar flares solar winds prominences

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?