Cell-tissue-organ-organ system
Transform nutrients so that they can be absorbed into the blood.
• your digestive system breaks down the food so that your body can receive the necessary nutrients required to maintain homeostasis in your body and whatnot
Living nature
Tell me if it helped
The correct option is B.
For a mature woman, each month the increased level of estrogen hormone leads the pituitary gland to secrete luteinizing hormone. Once this hormone is secreted, the ovary releases a single egg which moves down to the lining of the uterus. If fertilization does not occur, the egg is shed together with the lining of the uterus in a monthly process called mensuration. If fertilization occur, then the fertilized egg attach to the lining of the uterus and placenta is formed. The fertilized egg then send signal to the ovary to keep secreting progesterone, which will sustaining the pregnancy by keeping the uterus lining thick and nourishing for the developing embryo.
The answer is B. They are in control of the experiment, they can change it the variables to better help the experiment.