What is the colored, pigmented part of the eye?

What is the relation ship between structure and function in an organism

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

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the