Frederick wanted to findout what soil works best for growing roses. he greq them in potting soil, clay, sand, he found outside his yard. after one week, he measured their height and how many leavesthey had. what is the independent, dependent, control and constant?

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