Do ships use echolocation
explain in your oown words

Yes.

Explanation:

If the water is shallow, sound waves will reflect off the bottom of the ocean and will return faster than in deep sea. But in deeper water, the sound waves will take longer to travel to the bottom and return. Ships and submarines also use sonar to navigate at sea.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

c. heat from the poles back down towards the equator.