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An educational diagram illustrating the life cycle of a caddis fly in a river ecosystem, showing eggs under a leaf, larvae on the riverbed, a pupa in a case, and an adult insect.

An educational diagram illustrating the life cycle of a caddis fly in a river ecosystem, showing eggs under a leaf, larvae on the riverbed, a pupa in a case, and an adult insect.

An educational diagram illustrating the life cycle of a caddis fly in a river ecosystem, showing eggs under a leaf, larvae on the riverbed, a pupa in a case, and an adult insect. Voir plus

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An illustrated timeline showing the evolution of life from microscopic organisms in the ocean to early aquatic life, reptiles, mammals, and eventually human evolution walking from left to right across distinct vertical panels.

A diving beetle swimming underwater near a submerged log, carrying a bubble of air.

An educational diagram illustrating the food web of Lake Washington, featuring phytoplankton, invertebrates, and various fish species with connecting arrows indicating trophic levels.

An educational diagram illustrating the water cycle with mountains, a lake, clouds, and the sun.

A detailed wildlife illustration of a lush swamp or wetland landscape with a variety of animals including an alligator, elephant, rhinoceros, birds, turtle, and insects.

Deep sea scene featuring a bioluminescent jellyfish, a long-fanged predatory fish swimming upward, and a smaller fish near the dark ocean floor.

An underwater scene filled with various marine life, including an octopus, a whale, coral reef fish, an anglerfish, a seahorse, and a catfish swimming in clear blue ocean water with sun rays piercing the surface.

Close-up of several weathered, dirt-covered metal coins resting on a sandy seabed underwater, with sunlight filtering through the water.

An illustration of a dense prehistoric jungle featuring various dinosaur fossils and skeletons, including a long-necked dinosaur skeleton, a T-Rex skull on a rock face, a Triceratops skull, and a small ankylosaurus.

An underwater split-shot photo of a fantastical hybrid creature with the head of a platypus and the scaly, armored body of a sturgeon swimming in a clear river.

A digital painting of a marshland or wetland landscape with pussy willow trees, tall grasses, and winding streams under an overcast sky.

An educational diagram titled 'Forest Habitat Layers' illustrating the canopy, shrubs, herbs, and forest floor with animals and plants.

Close-up photograph of clear water flowing over moss-covered stones in a sunlit stream.

A silver fish swimming in a clear freshwater stream with stones and water plants visible underwater.

Illustration of three stones in a calm pond creating ripples, with the text THREE SMALL CHANGES arched above, surrounded by plants and insects.

An illustrated woodland scene depicting various animals like owls, squirrels, mice, and foxes near a river and a hollow tree.

Close-up of a patterned snake's head underwater, surrounded by air bubbles and aquatic vegetation.

An educational diagram illustrating the cross-section of a riverbank ecosystem, showing various plant zones, soil layers, and labeled parts.

An underwater view of a clear lake or riverbed with sunlight filtering down through water, surrounded by green aquatic plants, lily pads, and rocks.

A prehistoric landscape featuring a river ecosystem with a beaver in the water, horses, a woolly rhinoceros, an elephant, and various insects and small creatures.

An illustrated timeline landscape depicting prehistoric earth eras alongside a modern city in the distance.

An educational illustration depicting a riverbank with labeled plants including creeping buttercups, tall grasses, and hawthorn saplings.

A watercolor painting of a serene pond with reeds, purple flowering plants, and a dragonfly resting on a leaf.

A brass magnifying glass rests on the forest floor among fallen autumn leaves, tiny saplings, and small fungi.

An African clawed frog sits on the muddy bottom of a shallow body of water.

A mosquito larva hanging from the surface of water underwater.

A scallop swimming underwater, ejecting a stream of water and sand from its shell above a sandy seabed with sea grass.

An underwater macro photograph of a small crustacean, such as an amphipod, on a submerged decaying leaf over a pebble-strewn riverbed.

Close-up underwater view of smooth river rocks and flowing clear water with bubbles.

An osprey flies over a river where a fox walks on the grassy bank and a fish swims underwater.

A kingfisher dives into a clear river, captured half above and half below the water's surface.

A fuzzy, segmented, caterpillar-like creature underwater above a sandy seabed with light filtering down from the surface.

An illustrated woodland scene with a hedgehog on the left and a frog holding a leaf umbrella and a stick on the right, with a glowing trail of magical light between them.

An underwater illustration of a scuba diver examining a large glowing coral reef structure.

An underwater close-up of a snail crawling on a moss-covered rock in a clear freshwater stream.

An educational illustration depicting a wildlife habitat pile of deadwood and leaves with a hedgehog, frogs, insects, and an informational sign.

An underwater view of a freshwater lake or river bed, featuring dense aquatic plants, lily pads reaching the surface, and sunlight filtering through the water.

A detailed educational cross-section illustration showing the riverbank, water, soil layers, and various plants with visible root systems.

An underwater view of a speckled fish stirring up silt and sand from the bottom of a shallow, sunlit river.

An underwater close-up photograph of a dragonfly nymph near a submerged stick and aquatic plants.

An educational illustration showing four different types of fishing gear underwater: bottom trawl, longline, lobster trap, and purse seine.

An illustrative split-screen artwork showing multiple ecosystems, including an underwater marine scene, a temperate forest, an African savanna, a dense jungle canopy, and a river flowing through.

A tadpole swims near a mossy rock underwater in a shallow stream.

A transparent tadpole clinging to an underwater rock in a clear stream.

An educational diagram illustrating the water cycle, showing evaporation from the ocean, condensation into clouds, precipitation over mountains, and collection in rivers and oceans.

An underwater shot of an octopus reaching out of a rocky crevice toward a hermit crab in a shell.

A watercolor illustration of a tranquil stream flowing through a lush green forest with ferns, mossy rocks, and small blue flowers.

A tadpole shrimp crawling along the muddy bottom of a shallow body of water.

A tiny water flea (Daphnia) swimming underwater beneath duckweed roots.

An underwater photograph of a freshwater mussel resting on the sandy and pebbled bottom of a clear stream.

A serene forest river with lily pads and blue flowers in the foreground.

An educational illustration depicting various South American mammals in a lush tropical savanna and river ecosystem, with labels pointing to animals such as a spectacled bear, giant anteater, tapir, and pink river dolphin.

A close-up photograph of a snail with a patterned shell resting on a mossy rock near a flowing stream.

A sea turtle swimming gracefully through a vibrant coral reef with sunlight filtering through the ocean water.

An underwater view of a shallow freshwater body with sunlight filtering through water onto aquatic plants, lily pads, and a rocky bottom.

An underwater photograph of a water bug swimming among aquatic plants and roots.

An educational illustration showing a cross-section of a riverbank with soil layers, plant roots, and flowing water.

An underwater close-up shot of an aquatic insect nymph clinging to the underside of a submerged rock in a clear stream.

A watercolor painting of a lush forest floor with horsetail plants, moss, and a small stream reflecting sunlight.

A transparent glass eel swimming among underwater roots and debris in a sunlit stream.

An educational diagram titled THE OCEAN DEPTH ZONES illustrating marine life and layers including surface, middle, and deep zones.

A digital painting of a riverbank with exposed tree roots, green grass, rocks, and yellow wildflowers blooming near the water.

A lush, green forest stream winding through ferns and moss-covered trees.

A digital painting of a marshland with tall grasses and calm water under a cloudy sky.

An underwater close-up shot of a leech crawling over a moss-covered rock in a shallow stream.

A tiny tardigrade crawling among wet green moss under a microscope.

A kingfisher diving into a clear river, captured half above and half below the water surface with a splash.

Close-up of a caddis fly larva inside its protective case made of small pebbles on a riverbed.

A blue kingfisher diving into a clear river, creating water splashes above and below the surface.

A small pink shrimp on the sandy seabed among seaweed and coral, lit by sunlight filtering through clear water.

An educational illustration depicting the life stages of an arve pine tree, from seed and seedling to young tree, mature tree, and fallen trunk.

A large, speckled egg rests on mossy ground in a prehistoric forest filled with ferns and tall trees under soft sunlight.