Which have different numbers of electron? A) different ions of an element
B) different isotopes of an element
C) the nucleus of an element
D) each of the atoms of an element

yes, because even though a theory has a  lot of evidence to support it, it is not always true

the species living around the vents are especially good at dispersal.  

deep-sea vent originates on the floor of the ocean when seawater circulates through hot volcanic rocks, usually situated where the new oceanic crust is being produced.  

biological dispersal refers to the movement of species from their location of birth to their site of breeding, or from breeding site to another. similarly, the oceanic dispersal refers to the movement of the species from one land mass to another by sea crossing.