Question

what adaption would be most beneficial to both taiga and marine aquatic biomes?

Answer 1

Both biomes must adapt quality of temperature regulation.

In aquatic marine biomes, fishes have gills that allow them to breathe the water. Other animals are mammals that need to come to surface to breathe but spend much of their lives in the water, so they must adapt quality of temperature regulation.

The mammals of taiga biome must adapt characteristic of temperature regulation to survive the cold winter.