Final answer:
The grade of the placenta refers to its condition and how well it is functioning to nourish the baby during pregnancy.
Step-by-step explanation:
The grade of the placenta refers to the condition of the placenta as it progresses during pregnancy. It is not related to a score based on calcium deposits. The grade of the placenta indicates how well it is functioning and transferring nutrients and oxygen to the baby. As the pregnancy progresses, the grade of the placenta may change and affect the supply of blood and oxygen to the baby.