Answer: The enzyme is found in different types of cells.
Explanation:
The result that can be concluded is that this enzyme is found in different types of cells. This is the reason that the medicines like aspirin and other non-steroidal anti inflammatory drugs inhibit the prostaglandin pathway and other pathways too.
These medication acts on the enzymes and it will act in the cells where this enzyme will be present. Hence, the enzyme is acting in different types of cells.
I'm gonna say D is the answer.
Shark Respiration would be an example of Hypothesis for goldfish respiration
Stem cells are very controversial for several reasons. Mainly, because stem cells need to be harvested from Embryos, which raises a huge ethical debate as to weather the (scientifically speaking, alive) embryo harvesting is not cruel and twisted, as these are human beings that are being used. Another ethical issue is that it is related to human cloning, and often times stem cells are mislabeled. Not to mention that there is an argument for the idea of cloning humans to be used for limb replacement, throwing everybody in a tizzy. Overall, one of the greatest medical acheivements of recent years has lots of issues that haunt it.