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Sound is a main mean of communication and entertainment and is also very effective alarm system for some animal. A loud and unwanted or unpleasant sound causes discomfort and is called noise.
The release of unwanted sound in the atmosphere is called noise pollution.
The unit of sound level is decibel (dB). Noise level can range from 0 to more than 120 dB. Noise beyond 120 dB cause discomfort. The intensity of normal conversation sound range between 35 dB to 60 dB.
Why do scientists make biological collections? What are the scientific reasons for doing a collection? How is a collection done?
CARDIO PULMONARY BYPASS : Open-heart surgery is considered as one of the most significant advances in medicine of 20th century. Establishment of safe cardio pulmonary bypass (CP
Tools of lower paieolithic age Pleistocene times there were huge herds of very large mammals. Bones of such large mammals were found associated with the human fossil finds and
Define Transverse section of body of male Ascaris? 1. Body wall consists of the following: (a) Cuticle is the outermost layer. It is a thick, tough, elastic membrane
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Define Tertiary Prevention- preventive strategies for food allergy? Tertiary Prevention: Targets the control of factors that cause symptoms. This strategy would be appropriate
what are the characteristics of polychaeta
a) What new combinations of characteristics might arise in the offspring when a tall plant with white flowers is crossed with a dwarf plant (of the similar species) with red flower
What is Periotest Periotest: An electronic device originally developed by Schulte designed to measure the dampening effect or attenuation degree characteristics of the peri
Explain about the Incidence of defects in color vision Defects in colour vision can either be congenital or acquired. Males are more affected than females. Out of the populatio
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