Question

modern cell theory states: cells contain and pass on hereditary information during cell division; and all cells are relatively the same in relation to chemical composition and metabolic activity. why did the cell theory get expanded? because of new antibiotics discovered by scientists because of new observations found by scientists because of new fossils found by scientists because of new genetic engineering techniques discovered by scientists

Explanation:

Scientific theories expand with new evidence. In cell - theory's case, new observations about cells' structure, function, and behavior by scientists led to its expansion. Antibiotics, fossils, and genetic engineering techniques are not directly related to the expansion of cell theory based on its core tenets about cells.

Answer:

because of new observations found by scientists