AP BIOLOGY

Detailed explanation-1: -The octopus is an osmoconformer because it ensure that the osmotic pressure of fluids inside it are in level with the osmotic pressure of fluids in its environment.

Detailed explanation-2: -Osmoregulators actively control salt concentrations despite the salt concentrations in the environment. An example is freshwater fish. The gills actively uptake salt from the environment by the use of mitochondria-rich cells.

Detailed explanation-3: -The hemolymph, pericardial fluid and urine of cephalopods, including the common octopus, are all isosmotic with each other, as well as with the surrounding sea water. It has been suggested that cephalopods do not osmoregulate, which would indicate that they are conformers.

Detailed explanation-4: -Most marine invertebrates such as starfish, jellyfish and lobsters are osmoconformers. Osmoregulators are organisms that actively regulate their osmotic pressure, independent of the surrounding environment. Many vertebrates, including humans, are osmoregulatory.