Basic General Knowledge
Nowadays many novel chemicals are being synthesized termed as xenobiotics. The unique feature of these is what they are I.biodegradable II.non- biodegradable III.pose on environmental threat IV.they are environment friendly

II, III
I, III, IV
I, III
II, III, IV

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Basic General Knowledge
The Rh factor refers to

a process that speeds up the clothing of blood
the ratio of red corpuscles to white corpuscles in the blood
a hormone carried by the blood
a protein substance found in the blood of some people

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