When dead animals break down, which of the following is released into the atmosphere? calcium, carbon dioxide, oxygen, greenhouse gase

carbon dioxide

Explanation:

when   animal dies their bodies get decayed by the actions of natural recyclers called decomposers e.g bacteria, worms, slugs.  most of the carbon they consumed while still alive is exhaled as carbon dioxide, and when the animal eventually dies the natural recyclers called decomposers  returns the carbon in their body back to the atmosphere in the form of carbon dioxide.

so therefore , when dead animals break down carbondioxide is released into the atmosphere.

thermophiles, notice the prefix thermo.

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.