In which of the following organisms does niche differentiation serve as a means of reducing intraspecific competition?

Seaweeds and Barnacles are common flora and fauna found in which of these habitats?

Competition between cow and goat for scarce grasses during dry season can be described as 

The oxygen transported to all parts of the body during blood circulation is used for the 

The presence of tiny, non-functional hind leg bones inside a whale's body suggests that whales