Answer:
The muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction.
Explanation:
Answer:
Soil getting dug up by moles.
Answer:
B: The virus has a long period of latency
Answer:
The atmosphere is a closed system
Explanation:
Because inside the atmosphere open system
