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Yogita Ingle 5 years, 6 months ago
The process by which a new species develops from the existing species is known as speciation.
Speciation is caused due to three factors, which are:
- Geographical isolation: Caused due to reproductive isolation in separated groups of a population.
- Genetic drift: Caused due to changes in the gene flow imposed by the isolation mechanism.
- Natural selection: Caused due to genetic variation within a population of an organism.
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Posted by ꧁༺★ṖŕīᑎƇɛ {Ƭĥɛ Ŀ❤Ѵɛ Ɠʊŕʊ}★༺꧂ ?? 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
A Cyclone is a large scale air mass that rotates around strong centers of low pressure.
- Water vapors are formed when water is heated.
- This heat is released to atmosphere when water vapors convert to water during rains.
- The heat released, warms the air around and makes it to move up. This also results in decreased air pressure.
- Hence, cooler air from surrounding rushes to take the warm air’s place.
- This repeats till a low pressure system with surrounding high speed winds is created. This is called a Cyclone.
- Cyclone depends on wind speed, direction, temperature and humidity.
Cyclones are also called Hurricane in USA and Typhoon in Japan and Philippines
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Lucifer ? Morningstar? 5 years, 6 months ago
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Lucifer ? Morningstar? 5 years, 6 months ago
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Posted by Papiya Chowdhury 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
(i) Area-wise Belgium is a small country in Europe.It is smaller in area than that of Haryana in India. It has a borders with Netherlands, France and Germany.
(ii) Regarding population it has a population of over one crore, about half the population of Haryana.
(iii) Besides, it has a very complex ethnic composition comprising various language speaking communites than India which is a secular and integrated country.
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Yogita Ingle 5 years, 6 months ago
Retrovirus, any of a group of viruses that belong to the family Retroviridaeand that characteristically carry their genetic blueprint in the form of ribonucleic acid (RNA). Retroviruses are named for an enzyme known as reverse transcriptase, which was discovered independently in 1971 by American virologists Howard Temin and David Baltimore. Reverse transcriptase transcribes RNA into deoxyribonucleic acid (DNA), a process that constitutes a reversal of the usual direction of cellular transcription (DNA into RNA).
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Meghna Thapar 5 years, 5 months ago
When HCl or HNO3 are mixed with water then they dissolve in water to form H+ or H3O+ ions which shows their acidic character. For example just see the following reactions
When alcohols and glucose are mixed with water then they do not dissolve to form ions. Hence they do not show acidic character.
Posted by Santoshi Behera 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
The heart is an organ that pumps blood throughout the body. It comprises four chambers:
- Atria (upper chambers)
- Ventricles (lower chambers)
The wall of the heart is made up of three layers:
- Epicardium- This is a protective layer made of connective tissues.
- Myocardium- This layer forms the heart muscles.
- Endocardium- This is the innermost layer and protects the valves and the heart.
Posted by Mahi..... ♾ 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
Ciliary Muscles:
- The ciliary muscle to which eye lens is attached helps the eye lens to change its focal length by changing radii of curvature of eye lens.
- When the eye is focused on a distant object, the ciliary muscles are relaxed so that the focal length of eye lens has its maximum value, which is equal to its distance from the retina.
- The parallel rays coming into the eye are then focused on the retina and we see the object clearly.
- When the eye is focused on a closer object the ciliary muscles are strained and focal length of eye-lens decreases. The ciliary muscles adjust the focal length in such a way that the image is formed on retina and we see the object clearly.
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Prashant Lohani 5 years, 6 months ago
1Thank You