Biology

Defense

Mechanisms that protect organisms from threats including predators, parasites, pathogens, and environmental hazards. Defenses can be structural, chemical, behavioral, or immunological.

Used in the Books

This term appears in 36 chapters:

Foundations Metabolism and Burn Rate

"The blue whale's blubber looks inefficient until the six-month fast begins. Your immune system is "wasteful" - using energy to maintain defenses against threats that may never come. But organisms without immune systems die at the first infection. The question isn't "how lean can we be?" It's ..."

Foundations Growth Mechanisms

"...cal principle still holds - you're just managing two tightly coupled plates, not ten independent ones. Regulated Industries: Biotech, aerospace, defense, and pharmaceuticals may require sustained investment across multiple growth plates for years before revenue appears."

Foundations Environmental Sensing

"...ogy.biomedcentral.com/articles/10.1186/s12983-015-0109-x [OPEN ACCESS] *Research on Daphnia water fleas demonstrating predator-induced morphological defenses - specifically the "neckteeth" that develop when juvenile Daphnia detect kairomones (chemical signals) from predatory phantom midges."

Foundations Symbiosis and Exchange

"...Market access: A merchant from Lübeck could trade in London, Bergen, or Novgorod with the same legal protections and infrastructure. - Collective defense**: Pirates couldn't easily attack convoys of League ships. Rival kingdoms couldn't blockade a single city without facing retaliation from the entire ..."

Foundations Ecosystem Thinking

"...n tree snakes arrived accidentally via cargo ships in the 1950s, 10 of 12 native forest bird species went extinct within decades. No evolutionary defense. No immigration of new species to fill niches. Total collapse. **Island biogeography teaches: size determines resilience, isolation determines uniqu..."

And 31 more chapters...

Biological Context

Defense is costly—energy invested in defense cannot be used for growth or reproduction. Organisms balance defense investment against other needs. Defenses evolve in response to specific threats and can become obsolete when threats change.

Business Application

Business defense: protecting against competitors, disruption, and threats. Defensive investments (moats, IP, customer lock-in) trade off against offensive investments (growth, innovation). Over-investment in defense can starve growth; under-investment leaves vulnerability.

Related Terms

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biologyecologysurvival