Insects have the most efficient system because their tracheal tubes allow oxygen to diffuse directly into the bloodstream.

Mammals have the most efficient respiratory system due to their ability to breathe through both lungs and skin.

Birds have a highly efficient respiratory system because air flows unidirectionally through their lungs, maximizing oxygen exchange.

All three groups rely on tidal breathing, making their respiratory efficiency roughly equal.

Specializations for rapid locomotion in all directions.

Specialized appendages along both sides for locomotion.

Complex behaviour.

Specialized sensory organs clustered at the anterior end.

The ability to breathe air.

The evolution of desiccation resistant skin.

The evolution of jaws for better prey capture and feeding.

The evolution of appendages that could support the weight of the body.

They reproduce quickly and produce many offspring to adapt to changing environments.

They live in small social groups and have long life spans.

They invest heavily in parental care and have low reproductive output.

They thrive in unstable environments with frequent disturbances.

They rely on high reproductive rates to offset low survival chances.