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754. What is the powder like material found on the wings of butterflies? What is its use?

Butterflies and moths belong to the taxonomic order, Lepidoptera. In Greek, Lepido means scales and Ptera means wings. In other words, Lepidoptera means scaly wings.
As the order name implies, the powder like materials found on the Butterfly wings are called scales.
Butterfly wings have two membranous layers which are made up of chitinous materials. Wings are nourished by a number of tubular veins which play a significant role in oxygen exchange.
Like all other insects, butterflies also have two pairs of wings, viz forewings and hind wings. The wing surfaces are generally covered with unicellular, setae(hair) like or flattened, overlapping scales. Scales are outgrowths of the body wall and they are of different colours.
There are two fundamental mechanisms by which colous are produced on butterfly wings. the ordinary colour, the first one, is due to the presence of chemical pigments, which absorb certain wavelengths of the light and transmit or reflect others.
The second colour, which is known as iridescent colour, is produced by the interference of light due to multiple reflections within the physical structure of a material and thus most of the butterflies exhibit brilliant iridescence on their wings.
 
755. How do Batteries get charged?

Inside each cell, chemical reactions take place involving the two electrical terminals (or electrodes) and a chemical known as the electrolyte that separate them. The good news is that if you're using a rechargeable battery, you can make the chemical reactions run in reverse using a battery charger.
Generally all smartphones we use contains lithium ion batteries.
A lithium-ion battery or Li-ion battery is a type of rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and back when charging.
 
756. What are galactic clusters?

Galaxy cluster is any group of galaxies whose gravity is enough to overcome the general expansion of the universe and hold it together. About half of all galaxies are found in clusters of one sort or another. The least impressive clusters, known as galaxy groups, typically contain a handful of large systems surrounded by a few dozen smaller dwarf galaxies – our Milky Way galaxy, for example, is one of three large spirals in the so-called Local Group. Dense clusters, however, may contain up to a couple of thousand galaxies including dozens of large spirals and elliptical (ball-shaped) galaxies. Curiously, the size of clusters does not vary all that much – they are always around one to ten mega parsecs (or 3-33 million light years) across.
 
757. Why do babies have their fists clenched almost all the time?

A newborn's hands are clenched because of a reflex called the palmar grasp reflex. It is present in newborns and will be present until the baby is 5-6 months old. You can stroke an object, like a finger, in a newborn's palm to see the reflex. The baby will close his fingers and grasp the finger.
 
[emoji335] Know About Company [emoji335]

Name: Visa
Industry : Financial Services
Founded: 1958 (as BankAmericard)
Fresno, California, United States
Area: Worldwide
Founders: Dee Hock
Products: Credit Card and Payment System
Headquarters: Foster City, California, United States
Website: www.visa.com
 
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