Just like land animals, marine fish breathe oxygen. they do so by directing a flow of ocean water over their gills. what can you conclude from this information? a. ocean water contains a large amount of dissolved oxygen gas
b. ocean water undergoes fission inside fish gills
c. fish excrete cellular waste through their gills

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Temperatures in ponds and lakes vary by season. select the best answer from the choices provided t f

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.