The idea that all living things are composed of cells and that all cells come from other cells defines:
a. central dogma
b. the laws of inheritance
c. organelle theory
d. cell theory
e. inheritance of acquired characteristics

D. cell theory

Explanation:

According to my research on studies based on genetics and biology, I can say that based on the information provided within the question the idea being described in this situation is called Cell Theory. This theory (like mentioned in the question) states that all living organisms are made up of cells, which are the building blocks of all organisms, and that these cells come from pre-existing cells.

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