What is wrecked?
A destroyed house or ship.
sunken
lying at the bottom of a body of water.
depths
a deep place in a body of water.
reef
A chain of rocks or coral or a ridge of sand at or near the surface of water.
What is organism?
an individual living thing.
What is Ecosystem?
a community of organisms and its environment functioning as an ecological unit.
Porpoises
small gregarious toothed whales
Glance
to take a quick look at something
Coral
the calcareous or horny skeletal deposit produced by polyps
marine
of or relating to the sea
