Question

the digestive and respiratory rely on the ___ systems to transport needed materials to the cells.
options: circulatory and muscular, nervous and digestive, circulatory and excretory, nervous and skeletal

Explanation:

The digestive system breaks down food into nutrients, and the respiratory system takes in oxygen. The circulatory system transports these nutrients and oxygen to cells. The muscular system helps with movement related to digestion (e.g., peristalsis) and respiration (e.g., diaphragm movement). The other options don't fit: nervous and digestive (nervous controls but doesn't transport), circulatory and excretory (excretory removes waste, not transport nutrients/oxygen for cells), nervous and skeletal (skeletal for structure, not transport). So the correct option is the first one.

Answer:

A. circulatory and muscular