What is non-point source pollution and why is this kind of pollution hard to monitor and control

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

When ash and dust begin to settle on the ground, they eventually become compacted by

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