Unlike freshwater fish, saltwater fish
a. often contain a lower concentration of salt than the water they live in.
b. tend to gain water from their surroundings.
c. would swell if they didn't conserve water.
d. would swell if they didn't eliminate salt.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.