Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour)
I'm pretty sure (D) is the right answer
Is poop edible because that would be crazy
The correct answer is B.
Air pollution can cause cardiovascular diseases as the pollutants in the air can damage your heart and lungs. This isn't always the case but if you live in a highly polluted area you are running the risk of developing a cardiovascular disease as well as other diseases related to the inhalation and exposure of toxins and chemicals in the air.