Atomic mass unit is the answer
Life on Earth is based on carbon, likely because each carbon atom can form bonds with up to four other atoms simultaneously. This quality makes carbon well-suited to form the long chains of molecules that serve as the basis for life as we know it, such as proteins and DNA.
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The answer is (2). To calculate the density, you need to divide the mass with volume. When doing division, the significant figures of result is the minimal of the numbers using before. So the answer is 2.
Answer:
Lower venous O₂ content increases the PO₂ gradient.
Explanation:
When we perform rigorous activities like exercise, more energy is utilized by the muscles. For the production of this extra energy, our cells need more oxygen to perform aerobic respiration and generate more number of ATP to fulfill the demand of body cells.
As a result the oxygen that is coming in the arteries are taken up rapidly by the cells and thus the oxygen content in the venous blood decreases. Due to the low amount of oxygen in venous blood the PO₂ of oxygen decreases in the venous blood and PO₂ gradient gets increased there.