A change most likeiy to result in two distinct phenotypes (and possibly, speciation).

a
stabilizing selection

b
directional selection

c
disruptive selection

d
acquired variation

Explanation:

Directional selection favors one extreme; stabilizing selection favors the middle of the range; disruptive selection favors both extremes and leads to two phenotypes.

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt