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For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]
Many aquarium tanks also have plants. An aquarist owns fish or maintains an aquarium, typically constructed of glass or high-strength acrylic. Aquaria with flat walls are known as fish tanks or simply tanks, while those with rounded walls are known as fish bowls. Size can range from a small glass bowl, a few liters in volume, to immense public ...
An ornate brass door hinge A barrel hinge. A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation, with all other translations or rotations prevented; thus a hinge has one degree of freedom.
An operculum (fish), a flap that covers the gills in bony fishes and chimaeras. The cover that rapidly opens a cnida of a cnidarian such as a jellyfish or a sea anemone. The lid may be a single hinged flap or three hinged flaps arranged like slices of pie. [1] [3] In insects, the operculum is the name for one or more lids covering the tympanal ...
The hinge ligament of a bivalve shell can be either internal, external, or both, and is an example of complex development. [5] Various types of hinge ligaments have been found in living species (i.e. extant species), and the ligaments can be reconstructed in most fossil bivalves based on their sites of attachment on the shell.
The hingemouth (Phractolaemus ansorgii) is a small freshwater fish that is found only in west central Africa, the sole member of the family Phractolaemidae of the family Kneriidae. The mouth can extend like a small trunk, thus the name, and has just two teeth, both in the lower jaw. Its mouth can extend up to 30% of the hingemouth's head length.
In South Africa. The Natal hinge-back tortoise is one of the smallest of the hinged tortoises.It has an elongated carapace up to 15.5 cm (6.1 in) in length which is slightly domed with a flat dorsal surface, although averaging between 8 and 14 cm (3.1 and 5.5 in) in length.
A hinge joint (ginglymus or ginglymoid) is a bone joint in which the articular surfaces are molded to each other in such a manner as to permit motion only in one plane. [1] According to one classification system they are said to be uniaxial (having one degree of freedom ).