Ekushal's family is happy as he became a proud father to a baby girl. upon a
routine visit to the hospital, the doctor advised him not to skip the vaccination
schedule. while discussing the same at home, one of the family members suggested
that vaccination is not necessary for a girl child. kushal opposed this suggestion.
(a) what is vaccination?
(6) name the scientist who prepared the first vaccine?
(c) critically comment upon kushal's viewpoint.

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? a. nitrogen + hydrogen peroxide → hydrazine + water b. nitrogen + water → hydrazine + hydrogen peroxide c. hydrazine + hydrogen peroxide → nitrogen + water d. water + hydrogen peroxide → nitrogen + hydrazine

What are the student's observations and inferences before he starts his investigation?

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.