Question

which two body systems work together to break down food into chemical energy and rid the body of the waste produced during this process? muscular and skeletal; nervous and immune; digestive and excretory; skeletal and endocrine

Explanation:

To solve this, we analyze each option:

• Muscular and skeletal systems are for movement and support, not food breakdown/waste removal.
• Nervous and immune systems handle communication/defense, not food processing.
• Digestive system breaks down food into energy; excretory system removes waste from this process. This matches the question.
• Skeletal and endocrine systems involve structure/hormones, not food breakdown/waste.

Answer:

C. digestive and excretory