The respiratory system brings air into the lungs supplying the blood with oxygen. Oxygen is carried throughout the body to the organs and keeps the heart pumping and when the blood circulates back to the lungs the process starts over again.
Answer:
b genes contain the code to make proteins
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Nz=4326380 people divided by the area 103736mlz=42 people per square miles.
avs=21905140 people divided by 296909mlz=7 people mlz
The role that they play is they break down dead plants and animals and waste(poop). This allows for plants to get nutrients in the means of fertilizer from what the decomposes break down. It also prevents from dead plants and animals piling up.