Which level of organization is characterized by a group of cells that work together to perform a common function?
o
o
o
o
organ
tissue
organ system
organism

Tissues

Explanation:

Tissues are made of a group of cells that have similar functions.

well we can't tell you because we cant see the time give a screen shot or something.

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.