Two important unifying themes in biology are that (1) life is organized on many levels, and that (2): Please choose the correct answer from the following choices, and then select the submit answer button. Answer choices all living things can move, breathe, and communicate.
animals with bigger brains are capable of greater thought.
the genetic characteristics of individuals in a population change over time.
humans are more evolved and superior than bacteria.
living things can die.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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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.