What are the four types of friction?

List five ways we are indebted to phytoplankton

Why did the federal government end its support of yucca mountain as a site for long-term storage of nuclear water

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