Which of the following organisms can be found in fresh water habitat?

Spirogyra and pond skater can be found in a fresh water habitat. Spirogyra is a type of green algae commonly found in freshwater environments such as ponds and streams. It forms long, unbranched, filamentous strands that can be seen floating on the surface of the water. Pond skaters, also known as water striders, are insects that are adapted to life on the surface of the water. They are able to walk on water due to their specialized legs and are commonly found in calm freshwater habitats such as ponds and lakes. On the other hand, Sargassum and red mangrove are typically found in saltwater or marine environments, while dog fish is a type of shark that is also found in marine environments.