Question

Terrestrial amphibians and marine fishes are

Answer 1

Ureotelism

The water available to terrestrial organisms is lower, hence they need to convert ammonia to a less toxic substance, which requires less water for excretion.

Ureotelic animals excrete urea which is $10,000$ times less toxic than ammonia. Some examples are- terrestrial amphibians, marine fishes and mammals.

Final answer

$\left(B\right)$ Ureotelic