What does it mean that the genetic code is “highly conserved”?

What does it mean that the genetic code is “highly conserved”?​

a.​it resists modification from environmental mutagens

b.​the products of the genetic code – proteins – are almost the same in all organisms

c.​it is almost universal and has not changed in millions of years

d.​all organisms and organelles – without exception – have the exact same genetic code

e.​organisms can only use it a certain number of times

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