Identify the adaptations that help aquatic organisms to move easily in water.

The correct option is C 1, 2 and 4
$\bullet$ Aquatic animals have various structural modifications in their body that enable them to adapt to aquatic habitats.
$\bullet$ Their body is streamlined so that it can reduce friction in water and thus help them to move easily.
$\bullet$ They have fins as locomotory organs. Fins help in moving forward, turning, keeping an upright position or stopping.
$\bullet$ Webbed feet are ideal for birds that swim, on the water's surface or under.
$\bullet$ Usually birds have hollow bones that help them in flight.
$\bullet$ Animals living in very cold conditions have a layer of fat under their skin as insulation.