Leg bones

The classification of matter from bulk categories down to sub-types and constituent particles.

The histological layers of the adrenal gland from the external capsule through the three cortical zones to the central medulla.

The major stages and molecular components of eukaryotic protein synthesis, connecting nuclear transcription to cytoplasmic translation.

Regions of Peru.

The key internal and external components of a bicycle rear freehub ratchet mechanism.

Gaza Strip: boundaries + main cities + names

The layout of a standard monohybrid Punnett square showing parental gamete positions and the four offspring genotype combinations.

The functional layers, electrical contacts, and working mechanism of a photovoltaic solar cell under illumination.