What is the primary role of the respiratory system in living organisms?

a.
to make carbon dioxide

b.
to obtain oxygen

c.
to use up nitrogen

d.
to find hydrogen

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

1. seamount a raised footwall block between normal fault creates this 2. syncline break between rocks where a hanging wall rises relative to a footwall 3. hot spring on rolling hills, this a dip between hills 4. volcanic neck created when a block with hanging walls slips down between normal faults 5. caldera underwater volcano that never reaches above sea level 6. horst natural hot water on earth's surface containing many minerals 7. graben underwater volcano whose top is eroded flat by waves 8. crater less than a mile in diameter; looks like a bowl at the top of a volcano 9. guyot magma that filled the central vent that remains after the volcano has eroded 10. reverse fault over 1 mile in diameter; looks like a bowl over a volcano

Compare and contrast your sells take in oxygen, water, and food. what is one waste product that leaves your cells?