Retrieve your animal tissue specimens. if you have an edmentum lab kit, your specimens are frog skin, human cardiac (heart) muscle, and human red blood cells. as you did with the protist slide, start with the lowest magnification and record what you see. identify the structure of the tissue and whether you can see any individual cells and cell structures. repeat with the next two magnification settings. in the answer space, write down what you observed for each sample under each magnification

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.