"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"

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

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a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.