Fresh water fish have the same osmoregulatory mechanisms as the marine fish.
a. true
b. false

False

Explanation:

The osmoregulatory mechanisms in fishes are the gills, In freshwater, the gills pump in sodium ions, but in the ocean, they need to pump sodium and chloride ions out; to keep the osmoregulation.

The marine fishes gills have a particular type of cells called chloride cells.  The membrane of these cells has a sodium and potassium pump that regulates the amount of sodium and potassium that comes and goes inside the cell.

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle