Which of the following is not a parathyroid gland mechanism to maintain adequate levels of blood calcium? a) activation of osteoclasts b)increase calcium ion reabsorption by the kidneys c) increase intestinal absorption of calcium ions d) all are methods used to maintain blood calcium

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.