In the diagram, the ship send sound(?) waves to the water, to determine if there is anything there. If there is something like a sunken ship shown in the diagram, the waves return in a shorter time hence you can understand if theres something or now. This is the principle of radars and sonars.
Mimicry. This is when oraganisms imitate another oraganism whether it be physical or behavoioral.
I think its B B)Warm water rises and cold water moves in to replace it.
