Life's smallest functional unit—understand the fundamental principle: form = function, how these are built, divide, and express their designated characteristics to keep you alive.
Includes: cell structure, organelles, chemical signaling, cell division, gene expression, etc.
Systems work in synch—the nervous, endocrine, and muscular systems all must communicate to maintain homeostasis (and allow for coordination). How does this happen?
Includes: gas exchange, transport, immune system, inheritance, diversity of organisms, etc.