1. why are cancer cells or abnormal cells used in tissue cultures even when researchers are not studying-cancer

Well, there are always researchers studying cancer, but as the question is asking otherwise, it must be answered.

Cancer Cells can multiply in culture (outside of the body in a dish) without any growth factors, or growth-stimulating protein signals being added. This is different from normal cells, which need growth factors to grow in culture.

-Mabel <3

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /