The Animalia kingdom is the largest. Hope this helps!
♥Nikki♥
1) The level of Carbon dioxide grows with the emission of CO2 by humans, animals and by human activity but it's kept stable by the process of photosynthesis, for which plants need carbon dioxide, so they consume it
2) Oxygen is consumed by humans and animals, so its level would go down, but again: plants create new oxygen through photosynthesis
So the answer is: plants that undergo photosynthesis
B because... Batteries are a source of chemical energy and chemical goes to electrical because the electrical energy goes through the circuits and then lastly, the electrical energy transforms into wind energy (mechanical energy)