Question

match the body function with the two organ systems. internal organs are protected & movement is allowed.
circulatory
skeletal
nervous
muscular

Explanation:

Step1: Analyze Skeletal System

The skeletal system's functions include protecting internal organs (e.g., ribcage protects heart/lungs) and providing a framework for movement (along with muscular system). So it matches "internal organs are protected & movement is allowed".

Step2: Analyze Muscular System

Muscular system works with skeletal system for movement (muscles contract to move bones) and doesn't primarily protect organs. But since the function is shared by two systems, skeletal is one, and muscular is the other for movement (as muscles enable movement with bones). Wait, re - checking: The function given is "internal organs are protected & movement is allowed". Skeletal protects organs and, with muscular, allows movement. So the two systems are Skeletal and Muscular.

Answer:

Skeletal, Muscular