RESEARCH BASE
Search 3,721 documents across 34 fields — every claim tier-rated by evidence
3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.
1,519 results for "grade 2" — page 43 of 76
ZB_5_27 — Human Microbiome: Gut-Brain Axis and Microbial Ecology
The human body hosts approximately 38 trillion microbial cells — roughly equal to the number of human cells — comprising ~3,000 species of bacteria, archaea, fungi, and viruses, collectively termed the microbiome. The Hu
ZB_5_02 — Biological Networks and Systems Biology
Systems biology investigates how biological function emerges from the collective interactions of molecular components — genes, proteins, metabolites, and signaling molecules — organized into networks. Rather than studyin
ZB_5_12 — Wildlife Disease Ecology: Pathogens in Wild Populations
Wildlife disease ecology examines how infectious diseases (caused by viruses, bacteria, fungi, protists, and metazoan parasites) operate within wild animal and plant populations, investigating transmission dynamics, host
ZB_5_23 — Bioacoustics & Animal Communication
Bioacoustics — the study of biological sound production, transmission, and reception — reveals a hidden world of communication systems of extraordinary sophistication. Humpback whale songs contain hierarchical structure
ZB_4_02 — Extremophiles and Extreme Biology
Extremophiles are organisms that thrive in conditions lethal to most life — extreme heat, cold, acidity, radiation, pressure, salinity, or desiccation. Their discovery has fundamentally expanded understanding of life's b
ZB_4_12 — Landscape Ecology: Patches, Corridors, and Mosaics
Landscape ecology studies how spatial patterns of ecosystems — the arrangement, size, shape, and connectivity of habitat patches within a heterogeneous landscape mosaic — influence ecological processes including species
ZB_3_22 — Old-Growth Forests & Ancient Woodland Ecology
Old-growth forests — variously defined as primary forests that have developed over centuries without major anthropogenic disturbance — represent the most structurally complex and biologically diverse terrestrial ecosyste
ZB_3_21 — Soil Microbiome
The soil microbiome encompasses the entire community of microorganisms inhabiting soil — bacteria, archaea, fungi, protists, and viruses — constituting the most biodiverse ecosystem on Earth. [KEY FINDING] A single gram
ZB_3_23 — Coral Reef Ecosystem Dynamics
Coral reefs are among Earth's most biodiverse and economically valuable ecosystems, occupying less than 0.1% of the ocean floor yet supporting approximately 25% of all marine species (~830,000 species). Built over millen
ZB_3_20 — Kelp Forest Ecology
Kelp forests are underwater ecosystems formed by dense stands of large brown macroalgae (Order Laminariales), predominantly species of Macrocystis (giant kelp, reaching heights of 45–60 meters — among the fastest-growing
ZB_3_25 — Invasive Species and Ecosystem Disruption
Biological invasions — the introduction and establishment of species outside their native range through human activity — are recognized as one of the top five drivers of global biodiversity loss alongside habitat destruc
ZB_3_02 — Coral Reef Ecology: Symbiosis, Bleaching, and Biodiversity Hotspots
Coral reefs, built by tiny colonial cnidarians over millennia, harbor approximately 25% of all marine species while covering less than 0.1% of the ocean floor — earning the title "rainforests of the sea." The ecological
ZB_3_12 — Soil Ecology: The Living Skin of the Earth
Soil — far from inert dirt — is the most biologically diverse habitat on Earth, containing an estimated 25–30% of all species on the planet. A single gram of healthy soil harbors approximately 1 billion bacteria (from 10
ZB_3_24 — Phenological Mismatch: When Ecological Timing Goes Wrong
Phenological mismatch — the decoupling of historically synchronized ecological events due to differential responses to environmental change — has emerged as one of the most consequential ecological impacts of anthropogen
ZC_3_21 — Degrowth Economics
Degrowth (décroissance in French) is an intellectual and political movement that challenges the foundational assumption of modern economics: that economic growth — measured by GDP — is inherently desirable, sustainable,
ZC_3_20 — Universal Basic Income
Universal Basic Income (UBI) — a periodic cash payment delivered unconditionally to all members of a political community, without means-testing or work requirements — has moved from the fringes of economic debate to main
ZC_3_12 — Colonialism and Postcolonial Theory
Colonialism — the practice of establishing political control over foreign territories, administering their peoples, and exploiting their resources for the benefit of the colonizing power — was the dominant global politic
ZC_3_23 — Commons Governance — Ostrom
Elinor Ostrom (1933–2012), professor of political science at Indiana University Bloomington, became the first woman to receive the Nobel Memorial Prize in Economic Sciences (2009) for her groundbreaking work demonstratin
ZC_3_22 — Fourth Industrial Revolution
The Fourth Industrial Revolution (4IR) is a framework articulated by Klaus Schwab (founder and executive chairman of the World Economic Forum) in his 2016 book The Fourth Industrial Revolution, describing a new phase of
ZC_3_02 — Sociology of Science and Knowledge
Sociology of knowledge examines how social conditions shape what counts as knowledge. Karl Mannheim (Ideology and Utopia, 1929/1936) argued that thought is "existentially determined" — shaped by the thinker's social posi
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