Elephant seals from antarctica dive into the ocean more than 1,500 meters deep at a time, nearly a mile. a seal can stay underwater for an hour or longer. in order to do that, the seal stores oxygen in its blood cells that is slowly released as it dives. the seal does not expend any extra energy releasing the oxygen stored in its blood cells. do you think passive or active transport is at work in the blood cells of the elephant seal? explain your answer.

In which of the following ways is the function of the surface of a microsphere similar to the function of an actual cell membrane? a.both make it possible for the conditions in the interior to be different from the conditions outside. b.both provide a barrier that keeps water from flowing across it so the interior remains dry. c.both separate the rna that forms in the interior from any rna that might form in the environment. d.both can actively move molecules into the interior or out into the surrounding environment.

What maintain homeostasis when a persons internal body temperature is 97.5°f

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?