Which of these is an example of a chemical change? O A. Freezing water
B. Tearing up a piece of paper
C. Dissolving sugar in water
D. Lighting a match

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

What must be true for natural selection to heppen

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