Human red blood cells placed in a 2% salt solution appear to shrink but burst when placed in a 0.4% salt solution. Which statement best supports these observations? Osmosis may occur in either direction across the cell membrane.

The nucleus regulates the amount of water the cell absorbs.

Salt is actively transported across cell membranes.

Salt causes cell walls to swell by absorbing into the cell.

The graph shows the amount of global warming happening in different ecosystems. which populations of organisms will likely decline the most as a result of climate change, and why? a. coral reefs because of the loss of the symbiotic algae living within their bodies b. penguin populations because the fish they eat will move into warmer waters c. mountain-dwelling birds because rising sea levels will relocate their food sources d. large cats in the rainforest because of decreased habitat loss for their prey