Hagfish (Eptatretus cirrhauts) are a jawless marine vertebrate that are isotonic with their environment and are considered to be osmoconformers. How might this interesting adaptation limit the habitat that the hagfish can tolerate?
A) Hagfish are not limited by salinity.
B) Osmoconformers do not face the same pressures as osmoregulators and can live in any marine environment.
C) Individual hagfish will adapt to different salinities over their lifetime and, therefore, can inhabit any marine environment.
D) Hagfish habitat is limited by the salinity of the environment.
Answer: D