Mr. b has been transferred to your floor to wait and see whether the chest tube allows his lungs to completely re-expand. but when he arrives, he is in severe respiratory distress. he says "i felt better before i came into the er! is this tube doing anything

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

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

What kinds of molecules can pass through the cell membrane without any problem?