I think it's A and B but I'm not good at chem. I remember being asked a similar question and I believe this is correct.
No. light microscope is used to see cells
Answer: An air mass that originates over land in Central America is most likely<em><u> warm & dry.</u></em>
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The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart