Cell, Tissues, Organs, Organ Systems, Organism (Multicellular).
This is from the smallest component to largest components that make up a human organism.
Cancer would definitely need to be focussed on, air pollution is a known cause of cancer
Agreement or concord happens when a word changes form depending on the other words to which it relates. It is an instance of inflection, and usually involves making the value of some grammatical category "agree" between varied words or parts of the sentence.
They could have been exited and scared that there baby is getting older.