During summer months the weather is hot which causes A. Ozone levels to rise, making the air unhealthy to breathe
B . Ozone levels to fall, making the air healthy to breathe
C. Ozone levels are lower in places of low altitude
D . Ozone levels are higher in places of high altitude
E. Ozone levels are higher in places of high altitude

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.

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.