Five adaptive features of
earthworm

not really sure what you mean by that but I'm not just answering for the points so I'll try to help ya 1 feature would be that they can't hear or see anything they use vibrations to seek things out

I don't want it to look crowded so I'll post the rest inside the comment section

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.