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Tardigrade
Tardigrades known colloquially as water bears or moss piglets, are a phylum of eight-legged segmented micro-animals. They have been found in diverse regions of Earth's biosphere – mountaintops, the deep sea, tropical rainforests, and the Antarctic. Tardigrades are among the most resilient animals known, with individual species able to survive extreme conditions – such as exposure to extreme temperatures, extreme pressures, air deprivation, radiation, dehydration, and starvation. Tardigrades are prevalent in mosses and lichens and feed on plant cells, algae, and small invertebrates. When collected, they may be viewed under a low-power microscope, making them accessible to students and amateur scientists.
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Blood Vessels
Lacrimal Sac
Lacrimal Gland
Inferior oblique muscle
Sclera
Iris
Retina
Optic Nerve
The eye can be considered as a living optical device. It is approximately spherical in shape, with its outer layers, such as the outermost, white part of the eye and one of its inner layers keeping the eye essentially light tight except on the eye's optic axis. The optical components consist of a first lens that accounts for most of the optical power of the eye and accomplishes most of the focusing of light from the outside world; then an aperture in a diaphragm (the iris—the coloured part of the eye) that controls the amount of light entering the interior of the eye; then another lens that accomplishes the remaining focusing of light into images; and finally a light-sensitive part of the eye (the retina), where the images fall and are processed. The retina makes a connection to the brain via the optic nerve.