Sea Urchins and Sand Dollars belong to which class of Echinoderms?

Beetles belong to which of the following orders of Insecta?

This class of molluscs includes Nautilus, Squid and Octopus:

In which of the following is the fate of embryonic cells fixed, so that each contributes to development in only one way?

The exoskeleton of arthropods is composed of:

What is advantage of undergoing metamorphosis?

These bivalve molluscs are able to “swim” by quickly closing their shells:

A hydrolysis reaction:

A peptide bond is formed between:

Grasshoppers have a __________ for sound wave reception.