Complete the food chain by mentioning the names of the organisms in (c) and (d):
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(c) Snake
(d) Hawk
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What is the structure of DNA as proposed by Watson and Crick?
Name the white blood cells that:
(a) Show phagocytosis
(b) Produce antibodies
State any two harmful effects of acid rain.
Given below is a picture of a tree. Mention the scientific phenomena occurring in the parts labelled (a), (b) and (c).
