"explain the process of how the human circulatory system delivers blood that is rich with oxygen to all parts of the body and then returns the blood to the lungs and completes this cycle over and over"

"list 5 senses and how does the nervous system including the brain and spinal cord play a part in the process of each of these 5 senses."

" compare and contrast the difference between photosynthesis and cellular respiration. include glucose, water, oxygen, carbon dioxide and the sun"