Question

Which adaptation is best suited for life in the pelagic zone?

hard shell


tubelike body shape


gas-filled bag or swim bladder


numerous legs



Which habitat has a water level that changes with the tide?

salt marsh


sublittoral zone


abyssal zone


deep oceanic layer


In which environment would you most likely find animals with chemosynthetic bacteria embedded in their tissues?


sublittoral zone


hydrothermal vent community


rocky intertidal


abyssal plain

Answer 1

1) Gas-filled bag or swim bladder — provides buoyancy for life in the open (pelagic) water column.

2) Salt marsh — water level there rises and falls with the tide (intertidal habitat).

3) Hydrothermal vent community — chemosynthetic bacteria support animals (e.g., tubeworms) at vents.