MCQ
Why thyroxine is a hormone not an enzyme
- AIt is secreted in small quantity
- BIt is not a polypeptide
- CIt has no special effect
- ✓It is directly poured into blood
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$(i)$ It is the basic unit of classification.
$(ii)$ It is defined as the group of individuals which resemble in their morphological and reproductive characters and interbreed among themselves and produce fertile offsprings.
$(iii)$ Human beings belong to the species sapiens which is grouped in the genus Homo.