What’s the purpose of natural selection

The diagram illustrates the activity of vesicles during a cellular process.

Does the sun release radiant energy?

Dna, in the nucleus carries the genetic code for making proteins in ribosomes. in the diagram, b, represents the proteins produced. dna cannot leave the nucleus to carry the genetic information to the ribosome where proteins are produced. how does the genetic code get from the nucleus to the ribosome? what does a represent? now