Final answer:
Gravida and para are used in biology to express the number of pregnancies and the number of live births. Gravida represents the total number of pregnancies, while para specifically refers to the number of pregnancies that ended in live births.
Step-by-step explanation:
The terms gravida and para are used in biology to express the number of pregnancies and the number of live births.
Gravida is the total number of pregnancies, including both live births and pregnancies that ended in miscarriage, stillbirth, or abortion. Para, on the other hand, specifically refers to the number of pregnancies that resulted in live births.