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“Centuries of steady alluvion expanded the delta boundary far into the estuary.”

“Glaciologists paused their field measurements as the peaks erupted in a dazzling display of alpenglow.”

“A widespread blanket of altocumulus signalled an approaching cold front from the west.”

“The sun became blurred into a pale disk behind a thickening layer of altostratus.”

“The perfume house added a trace of ambergris to enhance longevity.”

“The shipping industry is investing heavily in green ammonia engines to replace heavy fuel oil on long-haul routes.”

“Limestone cliffs exposed by coastal storms revealed pristine spiral imprints of a prehistoric ammonite.”

“During amplexus, the male toad secures his grip using specialized nuptial pads on his forelimbs.”

“The soil sample contained an obligate anaerobe capable of reducing heavy metal contaminants.”

“Microtubule shortening drove chromosome segregation during mitotic anaphase.”

“Dandelions rely on anemochory to colonize disturbed grasslands across vast distances.”

“The mountain station anemometrograph recorded severe blizzard vectors.”

“Laser Doppler anemometry enables non-intrusive measurement of airflow velocities around wing flaps.”

“Migrating locusts rely on positive anemotaxis to track seasonal winds carrying fertile moisture zones.”

“The dominance of the angiosperm altered terrestrial ecosystems by providing fruit for diverse animals.”

“The chef prepared grilled anguilla with a citrus glaze for the tasting menu.”

“Early microscopists observed teeming animalcules in drops of stagnant pond water.”

“Control programs target Anopheles breeding sites to curb malaria outbreaks.”

“The lobster flicks its sensitive antennules to detect trace chemical scents carried by ocean currents.”

“Extreme heat stress at anthesis causes spikelet sterility and drastical yield reductions in paddy rice.”

“Humid weather accelerated the spread of anthracnose throughout the mango plantation.”

“Rapid urbanization has driven widespread anthropization of coastal wetlands.”

“Fossil combustion elevates the net atmospheric carbon anthropogenic-flux.”

“Nutrient fluxes now circulate as much through the anthroposphere as through natural cycles.”

“A winter anticyclone brought frost and clear skies.”

“Every spring, the pond resonates with the chorus of hundreds of breeding anurans.”

“Earth reaches its aphelion during the first week of July.”

“Ladybugs were introduced into the garden to naturally control the destructive aphid population.”

“Heavy metals diffused freely through the root apoplasis before encountering the Casparian strip.”

“The scarlet and yellow rings of the coral snake serve as unmistakable aposematism to would-be predators.”

“The lichen's apothecium produces microscopic asci that release fungal spores into the air.”

“The crustacean uses its specialized front appendage to crush hard mollusk shells.”

“Inland aquaculture operations must manage nitrogen-rich effluent to avoid local eutrophication.”

“Untreated aquaculture-effluent induced coastal eutrophication.”

“Upregulation of aquaporin expression allowed root tissues to optimize water uptake under drought stress.”

“A dense shale aquiclude prevented agricultural chemicals from permeating the deeper drinking reservoir.”

“Overpumping depleted the regional aquifer.”

“The clay aquitard retarded the vertical migration of contaminants toward the municipal well.”

“The arabinoxylan content in rye flour directly governs its water absorption during baking.”

“Regional aridification forced pastoralist communities to abandon centuries-old grazing territories.”

“Extreme aridity limits agricultural output.”

“Frightened by the approaching predator, the armadillo rolled itself into a tight, armored ball.”

“Rainforest floor cover often consists of shade-tolerant aroids.”

“The crab is a marine arthropod protected by a rigid outer shell.”

“The remote atoll encloses a shallow turquoise lagoon teeming with marine life.”

“Night divers watched aurelia drift gracefully beneath the moonlit surface.”

“A rigorous study of polar bear autecology highlights their vulnerability to sea-ice retreats.”

“Phytoplankton serve as the primary autotrophs powering marine ecological food webs.”

“Warming soils accelerate autotrophic-respiration faster than photosynthetic uptake.”

“Sunlight prompts auxin redistribution toward the shaded side of the stem, driving the plant to bend toward light.”

“Conifer growth ceases entirely within the designated avalanche-track.”

“Strict environmental regulations limit the use of any toxic avicide around open grain fields.”

“The coastal wetlands shelter a remarkably rich avifauna during the autumn migratory transit.”

“The avocet delicately swept its bill through the shallow water for insects.”

“Catastrophic flood surges triggered a river avulsion that redirected the main waterway across farmland.”

“Careful examination exposed tiny dormant flower buds nestling quietly within each leaf axil.”

“The biology class kept an axolotl in a terrarium to study regeneration.”

“Microbiologists identified a spore-forming bacillus responsible for the contamination of the sterile lab sample.”

“Hikers need special permits to camp in the rugged backcountry.”

“Through multiple generations of backcrossing, the researchers successfully introduced drought tolerance into the commercial wheat line.”