$A$ : Blood group analysis shows the human beings are more closely related to apes than to monkeys.
$R$ : The blood groups $A$ and $B$ are found in apes but not in monkeys.
Assertion and Reason both are correct and also correct explanation.
Assertion and Reason both are correct but not explanation of assertion.
Assertion is correct, but Reason is incorrect.
Both Assertion and Reason are incorrect.
Weismann cut off tails of mice generation after generation but tails neither disappeared nor shortened showing that
The homologous organs are
Wings of pigeon, mosquito and bat show
The Darwinian variations are
The stage next to was