Write a paragraph on an animal having a hard shell.
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Answer:
A shell is a hard, rigid outer layer, which has evolved in a very wide variety of different animals, including mollusks, sea urchins, crustaceans, turtles and tortoises, armadillos, etc.
Scientific names for this type of structure include exoskeleton, test, carapace, and peltidium.
The shells that are perhaps most familiar and most commonly encountered, both in the wild and for sale as decorative objects, are seashells, more precisely, the external shells of marine mollusks.
These are usually primarily composed of calcium carbonate, in the form of calcite or aragonite crystallised out in an organic matrix.
Calcium carbonate in mollusc shells can take different crystalline forms, one being nacre otherwise known as mother of pearl.
Other kinds of animal shells are made from chitin, bone and cartilage, or silica.
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Author:
parkerschaefer
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Answer:
The tortoise is a creature living on both water and land. There are about 225 species of turtles worldwide. Both the water turtle and the land turtle species are different. Turtles in India are mostly found in rivers and ponds. Turtles found in the sea are of large size. Due to the stone-like body, it is difficult to identify them on the ground. Turtles have four legs and a long neck which they can do in and out.
Its round body is covered with a solid material such as a cover. The upper part of the turtle is relievo and the lower part is flat. The number of turtles in the whole world is gradually decreasing. And their species is on the verge of extinction. If people are not brought awareness towards them, then this species can be completely destroyed. The turtle species is considered one of the oldest living species in the world.
It is also believed that these ancient species such as mammals, birds, snakes, and lizards had come to the earth before. To save the turtle species, 'World Turtle Day' is celebrated on 23 May every year throughout the world. The purpose of celebrating World Turtle Day is to attract people's attention to the turtles and encourage them to save.
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Author:
maggie-moocamacho
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