Which one of the following animals is correctly matched with its one characteristic and the taxon?
Animal - Characteristic - Taxon

The figures $(A-D)$ show four animals. Select the correct option with respect to a common characteristic of two of these animals.

What is common between the trichocysts of $Paramecium$ and the nematocysts of $Hydra$?

Select the incorrect statements from the following:
$A$. Digestive system in Platyhelminthes is incomplete.
$B$. Bilateral symmetry is a characteristic feature of adult Echinoderms.
$C$. Pseudocoelom is possessed by Aschelminthes.
$D$. Notochord is persistent throughout life in the class Chondrichthyes.
$E$. Members of class Reptilia maintain a constant body temperature.

Which of the following are correctly matched with respect to their taxonomic classification?

Which of the following is an oviparous animal with a four-chambered heart?