Which of the following happens when cancer occurs? a. The control of the cell cycle is impaired.
b. Cells cannot pass the G1 checkpoint.
c. Apoptosis or programmed cell death takes place.
d. The cells can no longer enter the cell cycle.

Why do we perceive objects as retaining their brightness under different lighting levels?

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

Why were the results whit just water so much different than the trials with the detergent ?