How do Rosa's body systems work together to get the molecules she needs into her cells?

Digestive system and circulatory system.

Explanation:

Rosa's body systems such as digestive system and circulatory system etc work together to get the molecules she needs into her cells. the digestive system provides molecules needed by the cell from break down of food molecules in order to generate energy in the form of ATP while on the other hand, circulatory system is responsible for the transportation of molecules or substances from one part to another part of the body.

energy and particles

that is wrong, its not thymus.