Introduces the unifying biology map: structure, information, energy, and change.

Explains atomic structure, chemical bonding, water polarity, and the four major biomolecule classes.

Compares cell designs, membrane transport, ATP, respiration, and photosynthesis.

Follows information from DNA replication through transcription, translation, and regulation.

Contrasts mitosis and meiosis, then connects inherited variation to population evolution.

Reassembles the full path from atoms to biodiversity and offers a final self-check.