explain how the cells, tissue, and organs within the circulatory system work together to enable it to perform its function of pumping materials around the body and removing waste products such as carbon dioxide.

the body has levels of organization that build on each other.Cells make up tissues,tissues make up organs,and organs make up organs system.

did you not listen in class or something ...

Explanation:

All of the organs and organ systems of the human body work together like a well-oiled machine. This is because they are closely regulated by the nervous and endocrine systems. ... Functioning together, the organ systems supply body cells with all the substances they need and eliminate their wastes.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.