Use the steps below to determine the correct order of the path that blood takes as it flows through the body.

a. the right side of the heart pumps blood from the heart to the lungs.

b. the oxygenated blood flows to the left side of the heart, where the blood is pumped to the rest of the body.

c. deoxygenated blood returns from the body and enters the right side of the heart, where the blood is ready for another trip back to the lungs.

d. in the lungs, carbon dioxide leaves the blood, and oxygen is absorbed in.

a, d, b, c

a, c, b, d

a, b, c, d

a, d, c, b

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

a = executive branch; b = judicial branch