Cell theory began to develop in 1839, following the research of matthias schleiden and theodor schwann into plant and animal tissues. both the botanist schleiden and the physiologist schwann noticed that every organism they viewed under a microscope, whether plant or animal, was composed of cells. their observations that all living species are made up of one or more cells led to the early formation of cell theory. which tenet of cell theory is described by the paragraph about the historical observations of cells?

Aheterozygous normal male marries a woman with a sickle cell anemia. give the genotypes and possible phenotypes of the offspring

Brainliest ! is slowing down a car an example of acceleration? explain. - explain correctly

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.