Help (also tell me what the phenotype and genotypes are)

Why are people not able to scuba dive in the deep part of the ocean

Ineed to find the answer of this question because i dont understand it

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.