On top of each kidney lies Adrenal gland. It's part of endocrine system. It's responsible for producing hormones like adrenalin, also steroids like aldosterone and cortisol. So in this case answer to your question is Adrenal gldans lie on top of kidneys
True-breeding plants have offspring with the same traits when they are self-fertilized.
Hope this helped!
I would say carbon dioxide
