Question

Most molluscs and cry fishes are:
A. Thermoconformers
B. Osmoconformers
C. Oxyregulators
D. All of the above

Answer 1

Hint: The word mollusca means "soft." These organisms can be found both on land and in the deep sea. Both molluscs and cry fishes cannot regulate their own body temperature and their internal temperatures are isotonic to their surroundings.

Complete step by step solution:
Mollusca is the second most populous animal phylum. Molluscs have an organ-system level of organization and can be terrestrial or aquatic (marine or freshwater). However, the majority of molluscs are marine.
They have a calcareous exoskeleton and a soft body. Examples include chiton, Octopus, and so on.
A thermoconformer is an animal that cannot regulate its own body temperature. A thermoregulator is someone who can regulate their body temperature internally.
Osmoconformers are marine organisms that have internal environments that are isotonic to their surroundings. This implies that the osmotic pressure of the organism's cells equals the osmotic pressure of its surroundings.
Oxygen regulation in animals and plants can be referred to as oxyregulation. Oxyregulators are any organisms that can achieve oxyregulation.

Hence, the correct option is D.


Note:
Many molluscs and cry fishes are oxyregulators, but with the exception of mammals and birds, they are also thermoconformers and osmoconformers.