MCQ
Identify $A$ in given figure.


- AMultilayer cell
- ✓Multicellular gland
- CUnicellular gland
- DSingle layer

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$(i)$ Every gene contains the information to express a particular trait.
$(ii)$ Gene responsible for $\beta$ - thalassemia is present on $21^{st}$ pair of autosomal chromosome.
$(iii)$ Mendel's approach of using mathematics to explain biological phenomena was totally new and unacceptable to many of the biologists of his time.
$R$ : It allows diffusion of water vapour from atmosphere to the body.