- 
  
   the invention of the microscope at the beginning of the seventeenth century, it became possible to take a first glimpse at the previously invisible world of microscopic life. the invention of the microscope at the beginning of the seventeenth century, it became possible to take a first glimpse at the previously invisible world of microscopic life.
- 
  
   Another new world of extraordinary variety, that of microorganisms, was revealed by the exciting investigations of another Dutchman, Antoni van Leeuwenhoek Another new world of extraordinary variety, that of microorganisms, was revealed by the exciting investigations of another Dutchman, Antoni van Leeuwenhoek
- 
  
  A Scottish Botanist who learned that a cell has a nucleus
- 
  
  A botanist that suggested that every structural element of plants is composed of cells or their products. and helped create the cell theory.
- 
  
  A zooaligist that helped Shliden with the cell theory
- 
  
  A scientest who created the basis of the theory of tissue formation which is every cell comes from a pre-existing cell.
- 
  
   The nucleus description- The Scottish botanist Robert Brown was the first to recognize the nucleus (a term that he introduced) as an essential constituent of living cells The nucleus description- The Scottish botanist Robert Brown was the first to recognize the nucleus (a term that he introduced) as an essential constituent of living cells
- 
  
   Hints at the idea that the cell is the basic component of living organisms Hints at the idea that the cell is the basic component of living organisms
- 
  
   scientest showed that cells are formed through scission of pre-existing cells scientest showed that cells are formed through scission of pre-existing cells
- 
  
   the central nervous system, nerve cells established anastomoses with each other through a network formed by the minute branching of their dendrites. the central nervous system, nerve cells established anastomoses with each other through a network formed by the minute branching of their dendrites.