Lichens are not a single organism — they are a stable symbiosis between fungi and photosynthetic partners (algae or cyanobacteria). The fungus provides structur…

A compost pile is not a pile of rotting material. It's a managed microbial ecosystem. Carbon-to-nitrogen ratio should be roughly 30:1. Too much carbon (wood ch…

The Cambrian explosion (~541 million years ago) saw the rapid diversification of most major animal body plans in a geologically brief window of ~20 million year…

Convergent evolution: unrelated lineages independently evolving similar traits in response to similar selective pressures. The eye evolved independently at lea…

r/K selection theory describes two ends of a reproductive spectrum. r-strategists produce many offspring with little parental investment (most die young); K-str…

Biomimicry — designing technology by copying natural systems — is a productive but often overstated framework. What nature optimizes for is reproductive succes…

Genotype does not determine phenotype uniquely. The same genotype can produce different phenotypes depending on environmental conditions — this is phenotypic pl…

The ocean absorbs about 30% of anthropogenic CO₂. The CO₂ reacts with seawater to form carbonic acid, reducing pH. Ocean pH has dropped by 0.1 units since indus…

MacArthur and Wilson's The Theory of Island Biogeography (1967): species richness on an island is a function of island size (larger = more species) and isolatio…

Ecological succession is the process by which a community changes over time toward a stable end state (the "climax community"). Pioneer species colonize disturb…

Roughly 90% of plant species form symbiotic relationships with mycorrhizal fungi. The fungal hyphae extend the plant's effective root surface area by orders of…

A keystone species has an outsized effect on its ecosystem relative to its biomass. Remove it and the ecosystem transforms. Sea otters are the classic example.…