In which animal phyla is metameric segmentation observed?

Crocodile and penguin are similar to whale and dogfish in which one of the following features?

Which of the following sets of animals is correctly matched with its respective phylum/class?

Based on the given figure showing cross-sections of animals,identify the correct classification for $a, b,$ and $c$ regarding their body cavity (coelom).

Which of the following represents the correct combination without any exception?
Characteristics - Class

$S$ - Statement: The presence of cnidoblasts is a characteristic feature of Cnidarians.
$R$ - Reason: In sponges,amphiblastula or parenchymula larvae are observed.