Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: What gland secretes a fluid that mixes with sperm to help form semen? Answer: prostate gland
The prostate gland secretes a fluid that mixes with sperm to help form semen. Semen is a whitish liquid that contains sperm. It passes through the urethra and out of the body.

Question: Liverworts are small plants that grow close to what? Answer: ground
Liverworts are small plants that grow close to the ground.

Question: The shape of the path of an object undergoing projectile motion in two dimensions is a what? Answer: parabola
The shape of the path of an object undergoing projectile motion in two dimensions is a parabola.