the correct answer is Carbon. I put hydrocarbon and it was wrong Carbon is 100% correct.
The state of butter has changed. it only melted, and no new substance is formed or mixed with another substance
<h2>♨ANSWER♥</h2>
The respiratory system supplies oxygen to the blood and removes carbon dioxide. The brain monitors respiratory volume and blood gas levels. The brain regulates respiratory rate.
<u>☆</u><u>.</u><u>.</u><u>.</u><u>hope this helps</u><u>.</u><u>.</u><u>.</u><u>☆</u>
_♡_<em>mashi</em>_♡_
Change in energy is E=hc/wavelength of emitted photon