Question

a. system x is the digestive system, and system y is the circulatory system.

b. system x is the respiratory system, and system y is the circulatory system.

c. system x is the digestive system, and system y is the respiratory system.

d. system x is the excretory system, and system y is the musculoskeletal system.

Explanation:

The question is about human body systems. The digestive system (System X) breaks down food, and the circulatory system (System Y) transports nutrients (raw materials) throughout the body. Option A matches this: System X is digestive, System Y is circulatory. Other options: B (respiratory deals with gas exchange, not food breakdown), C (respiratory doesn't transport food nutrients), D (excretory removes waste, musculoskeletal is for movement) are incorrect.

Answer:

A. System X is the digestive system, and system Y is the circulatory system.