Answer:
I believe the answer is C
Explanation:
Answer:
External factors include physical and chemical signals. Growth factors are proteins that stimulate cell division. – Most mammal cells form a single layer in a culture dish and stop dividing once they touch other cells. Two of the most important internal factors are kinases and cyclins.
An example of matter here is B. the light bulb.
Light bulbs are made mostly of glass and wires. Glass and wires have mass and take up space.
