After these three discoveries, cells, previously considered as mere pores in planttissue, could no longer be thought of as empty, because they contained living material. lessons in math, English, science, history, and more. If you look at a living matter with a microscope even a simple light microscope you will see that it consists of cells. Even after the publication in 1672 of excellent pictures of plant tissues, no significance was attached to the contents within the cell walls. Originally trained as a lawyer, he was really more interested in botany. It helped me pass my exam and the test questions are very similar to the practice quizzes on Study.com. These observations led two German scientists named Theodor Schwann and Matthias Jakob Schleiden to propose cells as the basic building blocks of all living things. 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