Astudent observes this cell under the microscope. he is discussing the structure indicated by the arrow with his lab partner. what would be the most likely classification of the cell pictured based on the structure they are observing? a) this cell is eukaryotic because it contains a nucleus. b) this cell is prokaryotic because it contains ribosomes. eliminatec) this cell is prokaryotic because it contains a nucleus with circular dna. d) this cell is eukaryotic because it contains membrane-bound organelles such as lysosomes and vacuoles.

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

What are two examples of conduction that we use everyday

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.