What happens when nitrogen fills its valence shell

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

The crust of earth may a- continets and ocean floors. b-continents only. c-layers of sedimentary rocks and continents. d-all of the above

Complete the sentence. the lower the hydrogen ion concentration, the the ph. higher lower closer to 7 closer to 0