4. 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. 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.

Based on the results of this study, what questions remain unanswered? how can these questions guide future research

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red. b) the pollen grains will be pure blue. c) the pollen grains will have red interiors and blue exteriors. d) the pollen grains will have blue interiors and red exteriors.

Describe the function of the endomembrane system? what organelles are involved?