Q: - The oxygen travels to the lungs through the windpipe - The air sacs in the lungs send the oxygen into the blood stream - The carbon dioxide in the blood stream is transferred to the air sacs - The lungs expel through the nose or mouth back into the environment. What might be the first step of the process?
A: You breathe oxygen into your body through the nose or mouth

Q: - The items are sorted - Trash is removed from everything else - Goes to a landfill - The items go into a baler machine for each kind of material - They come out as bales - The bales are shipped to manufacturers to use to make products. What might be the first step of the process?
A: Items are collected

Q: - The filter has small pores to catch pollutants - The filter will catch chlorine, heavy metals, and other chemicals - The filter allows water and mineral ions like fluoride to pass through - The water on the other side of the filter is much cleaner - What might be the first step of the process?
A: Water comes through a filter

Q: - Is exposed to air - A chemical reaction occurs - The iron starts to oxidize - The iron starts to rust. What might be the first step of the process?
A:
Iron is exposed to oxygen