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Meghna Thapar 5 years, 6 months ago
Polar bears live in the Arctic where the air and water temperatures are very cold. They have special adaptations, or features that help them live in that habitat, like webbed feet, a layer of fat, fur that helps them blend in and dry off, and black skin to absorb the sun's heat. Penguins are found on the exact opposite hemisphere ranging from the Galapagos Islands to the coast of Antarctica. Both the animals have developed attributes to adapt themselves to their habitat. While the penguins are attuned to colours of the sea to protect themselves from predators, the polar bears are white and furry that makes them one with their surroundings. Both the animals eat fish.
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Sonali Aggarwal 7 years, 1 month ago
A trapezium is a quadrilateral with exactly one pair of parallel sides.
Remember, a trapezium has only one pair of opposite sides to be parallel which clearly says it is not a parallelogram.
Posted by Shivam Kumar 7 years, 1 month ago
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Meghna Thapar 5 years, 6 months ago
The Sun is a huge, glowing sphere of hot gas. Most of this gas is hydrogen (about 70%) and helium (about 28%). Carbon, nitrogen and oxygen make up 1.5% and the other 0.5% is made up of small amounts of many other elements such as neon, iron, silicon, magnesium and sulfur.
Posted by Shivam Kumar 7 years, 1 month ago
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Yogita Ingle 7 years ago
Georges Lemaitre (1927) had proposed a model for origin of the universe which became the Big Bang theory. The Big Bang theory explains the origin of universe, with the key idea that the universe is expanding. In the past, the universe was denser and hotter. All of space was contained in a single point, which is considered the inception of the universe. After the initial expansion, the universe freezes that allowed the creation of subatomic particles, consisting of protons, neutrons, and electrons. The majority of atoms formed were hydrogen, along with helium and traces of lithium. Huge clouds of these primal elements later fused through gravity to form stars and galaxies. The massive elements were synthesized either within stars or during supernova. Hence, the Big Bang theory does not explain the initial condition of the universe, but instead it describes the general evolution of the universe.
Posted by Shivam Kumar 7 years, 1 month ago
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Meghna Thapar 5 years, 10 months ago
The endoplasmic reticulum (ER) is a large network of membrane-bound tubes and sheets which looks like long tubules or round or oblong bags (vesicles). There are two types of ER– rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER). RER looks rough under a microscope because it has ribosomes attached to its surface. The ribosomes are the sites of protein manufacture. The SER helps in the manufacture of fat molecules or lipids.
Posted by Priya Bhagat 7 years, 1 month ago
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Aditi Jain 7 years, 1 month ago
Parampreet Saini 7 years, 1 month ago

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Harsvardhan Gupta 7 years, 1 month ago
2Thank You