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Hydra is a genus of small, fresh-water animals of the phylum Cnidaria and class Hydrozoa.

Calmitacea inside a peace of stone. The fossil was growing in the Carboniferous Period (around 360 to 300 million years ago).

Dinophysis algae under microscopic view, Chromista, diatoms, phytoplankton, fossils, silica, golden yellow algae

The study parasite or worms is a freshwater fish parasite in laboratory for education.

Photomicrograph of head of brine shrimp, Artemia salina. Live specimen. Wet mount, 10X objective, transmitted brightfield illumination.

The small but mighty phytoplankton are the laborers of the ocean, they serve as the base of the food web

$Gorgonian sea fans are Cnidarians that build colonies in branching formations that usually are fan-shaped, thus the common name. \nGorgonians are octocorals: \neach polyp has eight pinnate tentacles which it uses to capture nutrients suspended in the water column. They are seen most often on reef crests, or jutting out from drop-offs or steep banks in locations where natural currents will sweep plankton and other organic nutrients across the polyps tentacles. \nTriton Bay, Kaimana Regency, West Papua Province, Indonesia, \n3°58'25.902 S 134°9'58.818 E at 5m depth$

Hydra vulgaris on darkfield under a light microscope, freshwater hydra taken from the pond

X chromosome with degrading or aging telomeres isolated on white background

Blue green algae under microscopic view, cyanobacteria, gram-negative bacteria that obtain energy via photosynthesis

plant Leaf of Mentha Haplocalyx T.S. under light mircoscope with white background

Imprint of an ancient plant on a stone in the hands of a man

Lichen growing on a rock, possibly marble, in a Connecticut rock garden. Though it undergoes photosynthesis, this is not a plant but a symbiotic composite of a fungus and an alga. Lichens also grow on trees and soil. This species appears to be rock greenshield lichen. Photo taken in winter.

pluteus larva of Hemicentrotus pulcherrimus

Sea Urchin spine fossil. The close-up image shows a sea urchin fossil from the jurassic period inside a limestone.

Hydra vulgaris under a light microscope, freshwater hydra taken from the pond

Style life of a geological find of a petrified fossil on a white background

Shrimp, Zoea stage with dead shrimp of Vannamei shrimp in light microscope, Larvae under a microscope, White shrimp, Nauplius, zoea, Larvae. Background.

Red seaweed floating in crystal clear water.

Tapeworms (Cestoda: Caryophyllidea), Parasites of Fish in Thailand.

Happy tardigrade- the water bear- a micro-animal living in moss that looks like it's smiling and dancing, from Shenipsit State Forest in Somers, Connecticut.

marine green algae under the microscope - optical microscope x100 magnification

Scleractinian coral fossil on a Ammonite fossil. Both from the jurassic period found in the canton of Aargau.

Mysis stage of Vannamei shrimp in light microscope, Shrimp larvae under a microscope, Shrimp, White shrimp, Nauplius, Zoea, Mysis, Larvae. Background.

$The polyps of this soft coral are extended, as they are feeding. It is an Ellisella species, probably Ellisella robusta. \nThe photo was taken in daytime with f/25 and strong strobe light to get a black background. \nTriton Bay, Kaimana Regency, Indonesia, 3°54'15.6068 S 134°6'47.1379 E at 9m depth$

Mitosis onion root tip cells under microscope

$Devonian microfossils in limestone matrix include circular and cylindrical crinoids, fan-shaped brachiopod (shell) fragments, speckled bryozoan fragments. Rock is about 1 1/2\$

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