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Ecology
| Question | Answer |
|---|---|
| Autotroph | a "self-feeding" organism that produces its own food and nutrients using inorganic materials like sunlight or chemicals |
| Heterotroph | an organism that cannot produce its own food and must obtain nutrition by consuming other organic matter, such as plants or animals |
| Organism | any individual living thing, ranging from microscopic bacteria to complex multicellular plants, animals, and fungi, that carries on life activities through interdependent, organized parts |
| Habitat | the natural environment where an organism lives, providing essential food, water, shelter, and space for surviva |
| Biotic factor | the living components of an ecosystem that shape their environment, including organisms, their interactions, and waste |
| Abiotic factor | the non-living physical and chemical components of an ecosystem that affect living organisms and the functioning of the environment. |
| Species | a group of organisms that can interbreed and produce fertile offspring |
| Population | the total sum of individuals (people, organisms, or objects) occupying a specific geographic area or sharing a common characteristic |
| Community | a collaborative research method that brings together community members and professional scientists to conduct, drive, or influence scientific research |
| Ecosystem | a dynamic, interconnected community where living organisms (biotic) interact with non-living (abiotic) elements like air, water, and soil |
| Ecology | the scientific study of interactions between organisms and their environment |
| Immigration | the process of individuals moving into a new country or region,, not their place of origin, with the purpose of living there permanently |
| Emigration | the permanent departure of individuals from their home country to settle elsewhere |
| Population density | the average number of people living in a specific area, calculated by dividing the total population by the total land area |
| Limiting factor | any biotic (living) or abiotic (non-living) resource or environmental condition that constrains a population's size, slows its growth, or restricts its distribution within an ecosystem |
| Carrying capacity | the maximum population size an environment can sustainably support without degrading its resources |
| Natural selection | a key mechanism of evolution where organisms better adapted to their environment tend to survive and produce more offspring. |
| Adaptation | Adaptation science encompasses two primary, distinct fields: biological adaptation (the evolutionary process) and climate change adaptation |
| Niche | the functional role and position of a species within an ecosystem, encompassing how it survives, reproduces, and interacts with its environment |
| Competition | a rivalry between individuals, groups, or entities striving for the same, limited goal, such as resources, market share, or victory in a contest |
| Predation | a fundamental ecological interaction where one organism (predator) kills and consumes another (prey), driving population dynamics, evolution, and community structure |
| Mutualism | a type of symbiotic relationship where organisms from different species interact, with both partners deriving benefits, such as increased survival, nutrition, or protection |
| Commensalism | a type of symbiotic relationship where one organism (the commensal) benefits—obtaining food, shelter, or transport—while the other (the host) is neither helped nor harmed |
| Parasitism | a symbiotic relationship where one organism (the parasite) lives on or inside another (the host), benefiting by deriving nutrients at the host's expense, often causing harm without immediately killing it |
| Parasite | tudies these organisms, including their structure, life cycles, and interactions with hosts, classifying them into classes like protozoa, helminths, and ectoparasites |
| Host | a living organism—animal, plant, or microbe—that harbors another organism (a parasite, pathogen, or symbiont) inside or near its body |
| Succession | Ecological succession is the predictable, gradual process of change in the species structure of a biological community over time. It describes how ecosystems develop, recover, and transition through various stages |
| Primary succession | the development of ecosystems in barren, uninhabited areas lacking soil, such as lava flows or retreated glaciers |
| Pioneer species | the first hardy organisms—such as lichens, mosses, and grasses |
| Secondary succession | the rapid process of ecological recovery following a disturbance—such as fire, flood, or farming—that destroys a community but leaves the soil intact |
| Producer | organisms that create their own food, primarily through photosynthesis (using sunlight) or chemosynthesis (using chemicals) |
| Consumer | an individual or group who purchases or uses goods, products, or services primarily for personal, family, or household use, rather than for resale |
| Herbivore | animals adapted to consume plants and algae as their primary energy source |
| Carnivore | an extreme, zero-carb, animal-based eating pattern that excludes all plant foods, focusing on meat, fish, eggs, and small amounts of low-lactose dairy |
| Omnivore | animals that consume both plants and animals |
| Scavenger | animals that primarily consume dead biomass, such as carrion (decaying meat) or rotting plants |
| Decomposer | organisms—primarily bacteria, fungi, and invertebrates like worms and insects—that break down dead organic matter, recycling nutrients back into the ecosystem. |
| Food chain | a linear sequence modeling how energy and nutrients transfer from one organism to another within an ecosystem |
| Food web | a complex, interconnected network of multiple food chains, representing the natural flow of energy and nutrients through an ecosystem |
| Energy pyramid | a graphical model showing the flow of energy through an ecosystem's trophic levels. |
| Nitrogen fixation | Nitrogen fixation is the essential process of converting inert atmospheric nitrogen (\(N_{2}\)) into ammonia |
| Biome | a large, distinct ecological region defined by its climate, geography, soil, and specific plant and animal communities |
| Climate | the long-term average of weather patterns over decades (typically 30 years), |
| Desert | arid regions covering about one-third of Earth's land, characterized by very low precipitation (usually <10 inches/year) and specialized, sparse vegetation |
| Rain forest | dense, warm, and wet forests characterized by high annual rainfall, a continuous, thick canopy of vegetation, and immense biodiversity |
| Emergent layer | the topmost layer of a rainforest, containing the tallest trees (up to 200–250 feet) that tower above the canopy. |
| Canopy | the study of the biological and physical processes that occur in the upper layers of forest ecosystems |
| Understory | the layer of vegetation beneath the main forest canopy, consisting of shade-tolerant shrubs, saplings, ferns, and herbs |
| Grassland | expansive, predominantly treeless biomes covered in grass, found on every continent except Antarctica |
| Savanna | focuses on the study, management, and conservation of tropical grassland-woodland ecosystems |
| Deciduous tree | woody plants that lose their broad, flat leaves annually, typically in the autumn, to conserve water and energy during cold or dry seasons |
| Boreal forest | the world's largest terrestrial biome |
| Coniferous tree | cone-bearing, woody plants—mostly evergreens like pines, spruces, and firs—characterized by needle-like or scale-like leaves and the production of resin |
| Tundra | a vast, treeless biome characterized by extremely cold temperatures, low precipitation, and short growing seasons, where tree growth is hindered by permafrost |
| Permafrost | ground (soil, rock, or sediment) that remains at or below 0°C (32°F) for at least two consecutive years |
| Estuary | a partially enclosed coastal body of brackish water where freshwater from rivers and streams meets and mixes with the salty ocean |
| Intertidal zone | the coastal area situated between the high tide and low tide marks, submerged during high tide and exposed to air at low tide |
| Neritic zone | the shallow, nutrient-rich, and well-lit part of the ocean extending from the low-tide mark to the edge of the continental shelf, typically reaching depths of about 200 meters |
| Biogeograpy | the study of the spatial distribution of organisms—plants, animals, and other life forms—across Earth over time |
| Continental drift | the theory that Earth’s continents were once joined as a single supercontinent, Pangaea, and have slowly moved over geological time. |
| Dispersal | the movement of organisms—such as seeds, spores, or animals—away from their birth site or parent population |
| Exotic species | an organism—plant, animal, or pathogen—that has been introduced, either intentionally or accidentally, to a region outside its natural, historic range. |
| Point source | a single, localized, and identifiable source of energy, radiation, or pollution, |
| Nonpoint source | pollution is caused by rainfall or snowmelt moving over and through the ground, picking up natural and human-made pollutants and depositing them into water bodies |
| Biodegradable | substances capable of being broken down into natural, non-toxic components—such as water, carbon dioxide, and biomass—by microorganisms (bacteria, fungi) over time |
| Natural resource | materials and substances found in nature |
| Soil conservation | managing soil to prevent erosion, degradation, and nutrient loss, ensuring long-term fertility for agriculture and ecosystem health |
| Crop rotation | the practice of growing different types of crops in the same area across a sequence of seasons to improve soil health, manage nutrients, and break pest/disease cycles |
| Contour plowing | a sustainable farming technique where soil is tilled across a slope, following its elevation lines rather than up and down |
| Conservation plowing | a farming practice that minimizes soil disturbance and leaves at least 30% of crop residue on the surface |
| Biodiversity | the variety of all living organisms—animals, plants, fungi, and microorganisms—and the ecosystems they form |
| Keystone species | an organism that has a disproportionately large, essential influence on its ecosystem's structure and biodiversity relative to its abundance |
| Endangered species | a plant or animal at high risk of extinction, likely due to habitat loss, climate change, or poaching |
| Threatened species | plants and animals at high risk of extinction in the near future |
| Extinction | the study of the permanent disappearance of species, |
| Habitat destruction | the elimination or degradation of natural ecosystems—such as forests, wetlands, and coral reefs—to a point where they can no longer support native species, |
| Habitat fragmentation | the breaking of large, continuous natural areas into smaller, isolated patches, primarily driven by human activities like urban development, road construction, and agriculture |
| Poaching | illegal hunting, capturing, or taking of wild animals or plants, driven by profit from high-value body parts (ivory, horn), food, or the exotic pet trade |
| Captive breading | the process of breeding animals in controlled environments—such as zoos, aquariums, and conservation centers—to prevent extinction and boost populations of threatened species |
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