A: The brain reaches between 75 and 80 percen | vedclass

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(A) The human brain grows rapidly during early childhood. It reaches $75-80\%$ of its adult size by the age of $2$ years and attains its full adult si

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) The human brain grows rapidly during early childhood. It reaches $75-80\%$ of its adult size by the age of $2$ years and attains its full adult size by the age of $6$ years.Regarding the Reason,evolutionary biologists suggest that the human gestation period has been shortening over time to facilitate the birth of infants with larger heads through the birth canal,which is a trade-off known as the 'obstetrical dilemma'.Therefore,both statements are scientifically accepted facts.

List-$I$	List-$II$
$(a)$ $Homo$ $erectus$	$(i)$ $650-800$ cc
$(b)$ $Neanderthal$ man	$(ii)$ $900$ cc
$(c)$ $Homo$ $habilis$	$(iii)$ $1400$ cc

$A$: The brain reaches between $75$ and $80$ percent of its adult size within the first two years,and its full size at the age of $6$ years.
$R$: From an evolutionary point of view,the human gestation period is believed to be shortening.

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Match the following columns:
List-$I$ List-$II$
$(a)$ $Homo$ $erectus$ $(i)$ $650-800$ cc
$(b)$ $Neanderthal$ man $(ii)$ $900$ cc
$(c)$ $Homo$ $habilis$ $(iii)$ $1400$ cc

Which one of the following pairs is mismatched regarding their appearance in human evolution?

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$A$: The brain reaches between $75$ and $80$ percent of its adult size within the first two years,and its full size at the age of $6$ years.$R$: From an evolutionary point of view,the human gestation period is believed to be shortening.