Achange in the natural sequence of bases in dna structure is called a a) mutation b) reconstruction c)revolution d) translation

A.) Mutation

Explanation:   Mutations result from changes in the base sequences in a DNA molecule. The sequence of bases determines the production of specific proteins that are necessary for cell function.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.