Question

Like all valid scientific theories, modern cell theory

Answer 1

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.

Answer 2

so your answer is:

builds on the work of earlier scientists

:)