Answer:
your arteries that are connected to your lungs are also connected to your heart and then you need to be in the vena cava which are connected to your heart as well so you need the veins
Found in every single organic molecule.
ethical scientist would follow scientific method they would also report accurate data and they're going to keep detailed records now an ethical scientist is not going to hide their experiment from the public the only reason you're going to hide your experiment from the public would be because you have something to hide being on ethical and it would also be unethical to make an unbiased conclusion
