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Answers
Explanation:
I can't understand the 4th question.
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Ans1= The principle of vaccination is based on the property of ‘memory’ of immune system. In vaccination, a preparation of antigenic proteins or inactivated/live but weakened pathogen is introduced into the body. When the vaccinated person is attacked by the same pathogens, the existing memory B-cells and T-cells. Hepatitis-B vaccine is produced from yeast.
Ans2= A diet that contains the proper proportions of carbohydrates, fats, proteins, vitamins, minerals and water necessary to maintain good health.
Ans3= The sound waves are mechanical waves because they need a material medium for proporgation like air or liquids like water,or metals like silver.
Ans4= At night the bat uses its hearing to navigate its way to prey. Bats catch insects continuously using echolocation, an advanced navigation system.The bat emits ultrasonic waves with very high frequencies.
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