Which of the following may not have been possible without the presence of ozone in the atmosphere? Respiration may never have developed.
Oxygen may not have been able to accumulate in the atmosphere
Life may not have been able to move onto Earth’s land surfaces.
Photosynthesis may never have developed.

Which type of neuroglia is found outside of the brain?

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.

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?