Mention one example each for animals with a chitinous exoskeleton and those covered by a calcareous shell.

(N/A) $1$. Animals with a chitinous exoskeleton: Arthropods possess a tough, chitinous exoskeleton. An example is the cockroach $(Periplaneta \text{ } americana)$.
$2$. Animals covered by a calcareous shell: Molluscs are typically covered by a hard, calcareous shell. An example is the apple snail $(Pila)$.