Biology
During which phase or phase of cell division,the morphology of the chromosomes is best studies?

Prohase,anaphase
Anaphase,metaphase
None of these
Telophase,anaphase

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Biology
Ozone hole refers to

decrease in thickness of ozone layer in stratosphere
hole in ozone layer
decrease in the ozone layer in troposphere
increase in the thickness of ozone layer in troposphere

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