(LO 1.3) Which of the following is correctly matched with its level of biological organization?
mitochondria - cells
liver - organ system
O glucose - molecule
insulin - organelle
musculoskeletal system - organism

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

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.

i hope this