Origins and complexity
From the first living systems to complex cells and multicellular organisms, explore several transitions in life’s history.
10 problemsCollections
Selected problems that share a subject or a research tradition. Each leads to its own overview and sources.
Within Biology · All collections
Genes and development
How do genomes and regulatory systems shape traits, reliable development, and repair?
32 problemsInside cells
Molecular traffic, cell machinery, patterned shells and signals between cells.
14 problemsGenomes and inheritance
How genomes change, DNA copying begins and inherited silencing persists.
12 problemsPlant biology
Plants responding to their surroundings, reproducing and diversifying.
10 problemsBiological timing
Daily clocks, seasonal signals and the timing of emergence and dormancy.
6 problemsEcosystems and their environment
Species interactions, geographic patterns, symbiotic partnerships and carbon moving through the ocean.
22 problemsSymbiosis
Recognizing a partner, building a shared body and maintaining a compartment inherited from a partner.
6 problemsAnimal navigation
Magnetic senses, stellar compasses, remembered smells and routes through the ocean.
4 problemsAnimal signals and responses
Camouflage, contraction and seasonal rhythms, with navigation as a separate branch.
11 problems