Based on my research, freshwater fish are a type of fish that has a higher concentration of salt than it's internal environment. With respect to osmoregulation, to fight this circumstance the freshwater fish has a kidney that makes the water to pass quickly.
Density = Mass/Volume
D = 6/(.06^3)
Here's a few: magnesium, oxygen, silicon, phosphate, and aluminum are all found in earth's crust in high proportion. oxygen being the highest proportion of any other element.
Egg, larva, pupa and adult
Most bacterias are heterotrophs. Meaning they can't make their one good ( sadly :3)
