Level 2 - Cells
The Cells level makes an obvious connection as many topics have something about cells in them, but in addition to this several concepts link topics together. Organelles are obviously explored in the two cell structure topics - The compartmentalization in B2.2 Organelles creates many of the organelles, but their functions are explored in B2.3 Cell specialization, and C2.2 Neural signalling. Membrane proteins feature...