The flippers of a Penguin and a Dolphin show $:-$

  • A
    $a$ and $c$
  • B
    $b$ and $d$
  • C
    $a$ and $d$
  • D
    $a, c$ and $d$

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Flippers of Penguins and Dolphins are examples of:

The hand of a man,the wing of a bat,and the flipper of a seal represent:

$A$: Archaeopteryx had free caudal vertebrae and a toothed beak with teeth like reptiles.
$R$: It is a missing link between reptiles and birds.

In evolution,studies can be conducted at the molecular level. For example,proteins found in the blood of humans and apes are similar. The base sequences in nucleic acids and amino acid sequences in proteins are similar in related organisms. What do all these examples specifically refer to?

Two organs which are similar in structure and origin,but not necessarily in function are called:

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