This is an example of Interspecific competition.
<span>In </span>ecology<span>, this is a form of </span>competition<span> in which organisms/individuals of </span>different species<span> compete for the same resource in an ecosystem such as food, habitat or living space. The other form of competition is </span>intraspecific competition<span>, which involves organisms of the same species.</span>
I believe that hybrid zones provide an opportunity to investigate the evolution of reproductive isolation.Hybrid zones are areas where hybrid offspring of two divergent taxa are prevalent and there is a line in the genetic composition of populations from one taxon to the other. A hybrid zone allows researchers to see what happens when closely related species come together. Reproductive barriers may be strengthened or weakened, depending on environmental and genetic factors.
B, cold with a high salt content, I believe.
Since density is mass divided by volume, adding salt would increase mass.
Temperature is related to kinetic energy and the distance between molecules/atoms of a substance. The hotter the substance, the more distance there is between particles.
Generally cold water is more dense. Hope i helped :D