Question

for what kind of external environment is a saltwater fish adapted? (1 point)
hypotonic environment
hypertonic environment
osmotonc environment
isotonic environment

Explanation:

A hypertonic environment has a higher solute concentration compared to the inside of the cell (or in this case, the fish's body). Saltwater has a high salt (solute) concentration. Saltwater fish are adapted to live in such hypertonic surroundings. In a hypotonic environment (lower solute outside), freshwater fish are adapted. An isotonic environment has equal solute concentrations inside and outside, and osmotic is a more general term related to osmosis (movement of water across a semi - permeable membrane). Saltwater fish have osmoregulatory mechanisms to deal with the hypertonic external environment (e.g., they drink seawater and excrete excess salts).

Answer:

hypertonic environment