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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.
a) Name the mineral elements needed by (i) bones, (ii) red blood cells, (iii) the thyroid gland b) Which of these elements is (i) present in milk, (b) lacking in milk?
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Discuss why Obelia is considered to be of special interest in Zoology as an animal showing an intermediate grade of organization.
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Sinus tachycardia is common. ECG abnormalities may reflect the underlying coronary artery disease by way of pathological Q-waves, ST-T wave abnormalities. Left ventricular hypertro
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