Neurotransmitters are chemical messengers that travel across the

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

Which are results of technological advances? people's increased exposure to new ideas the development of an increasingly global culture their value by people around the world the bringing of harmony to diverse groups of people the reduction of the number of people living in rural areas

The amount of radioactive isotopes contributing heat to earth is greater now than it was when earth was newly formed. question 20 options: true false