The one abt respiration the answer is the first one and circulatory system is the last one that says “delivery molecules …”
Salutations!
Determine the length of the object shown below.
The length of the scale is 5.6 cm.
Hope I helped.
Great question, but I believe you are mixing up atomic number with mass number. Assuming you are, 12.011 amu is the average mass of a carbon atom. For carbon, it can come in three forms: carbon-12, carbon-13, carbon-14. The number following carbon is the mass number of that particular carbon "isotope". The reason the average is so close to 12 is because carbon-12 is by far the most common, so the average should be (and is) very close to 12. Therefore, 12.011 is a weighted average of all carbon molecules, and carbon-14 is a particular carbon molecule that weighs 14 amu.
There's no reason, it's just because the sun has a gravitational pull
