Question

what functions does the muscular system perform?
it provides stability, movement, and posture.
it generates and conducts electrical signals.
it produces melanin, which protects from the sun.
it produces oil, which protects from foreign invasion.

Explanation:

The muscular system is responsible for movement, helps maintain posture, and provides stability. Electrical signals are mainly related to the nervous system, melanin - production is a function of skin cells, and oil - production for protection is related to skin glands.

Answer:

It provides stability, movement, and posture.