Living in the sea

Question

  1. Why do sea mammals, like whales and dolphins, have to come up to the surface of the sea more often than fish?

    • To feed on plankton and small fish

    • They need sunlight to remain healthy

    • To breathe air

    • They escape predators, like sharks, by surfacing

    • To find out where they are

Question




Image source: www.fish.govt.nz (July 2004)

 

  1. Fish need oxygen to live. They get most of this from ...

    • swallowing oxygen bubbles in the water.

    • eating water plants.

    • sucking oxygen trapped in rocks and sand.

    • oxygen dissolved in the water.

    • air at the surface of the water.