Biology
Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of

vitamins
enzymes
hormones
proteins

ANSWER DOWNLOAD EXAMIANS APP

Biology
Ozone hole refers to

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

ANSWER DOWNLOAD EXAMIANS APP