Collective psychology of the whole period is a theory which

Collective psychology of the whole period is a theory which Correct Answer Can explain all phases of historical development

Collective psychology of the whole period is a theory which can explain all phases of historical development.
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Four subjects ---physics, Chemistry, Mathematics and Biology ---were taught in four consecutive periods of one hour each starting from 8.00 a.m. At what time was the chemistry period scheduled? 1. Mathematics period ended at 10.00 a.m, which was preceded by Biology. 2. Physics was scheduled in the last period. 3. Mathematics period was immediately followed by Chemistry.
Which one of the following is not a collective noun?
Which of the following is not a collective noun?
which one is a collective noun?
Which one is collective noun?
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Be careful, there is a hive of bees on the tree. (which of the following is a collective noun?
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 Which of the following word is collective noun?