What causes the tides? (4 points) a. the wobbling of the earth on its axis b. the tilt of the earth on its axis c. gravity of the moon and sun d. unequal heating of the earth's surface

Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

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