Because Theyr lungs don’t get enough air they are supposed to
Exotic species do not have a niche in the ecosystem that they are in. Therefore they take up resources that native species rely on to survive. Exotic species also have no natural predators in that environment causing them to flourish and multiply quickly.
This was because one cannot view a single strain of DNA as it is too small for one to visually comprehend.
Freshwater does not contain any salt, salt water does however contain salt.
