Dear science teacher,
When giving assignments, it would be helpful if you elaborated in the instructions in some places. Because I really have no clue what the hell you mean when you say "explain how these parts work together". And did you really feel the need to ask how scientists study the pathway? I'm already having a hard enough time with this assignment, don't make it harder. =|
Signed,
your confused student
P.S. Thanks for screwing with my sleep pattern even more (even though it was also partially my fault as well =X)