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Robert Hooke

Theodor Schwann

Bacteria

Unicellular has one cell and multicellular has more than one cell

5

The basic building blocks of all living things

Microscope

living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.

Virchow used the theory that all cells arise from pre-existing cells to lay the groundwork for cellular pathology

He created the single lens microscope,he did a lot a research on small animals such as fleas. He helped disprove the theory of spontaneous generation.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it