Respuesta :
so your answer is:
builds on the work of earlier scientists
:)
The right answer is A.builds on the work of earlier scientists.
The cellular theory appeared in the 19th century, it consists of three principles:
1) All living organisms are made of at least one cell.
2) The cell is the basic organizational unit of life.
3) All cells come from other living cells
The cell is the structural and functional unit of an organism.