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Science: Crossword Puzzle Week #23

Across
Uses sound waves to see underwater
Heat emitted by the bodies of nearby animals
Use of sound waves and echoes to determine the location of objects
Waves that travel through space at the speed of light
Are fish that live in underwater caves
Down
What allow you to detect smells, and the more you have, the better your sense of smell is
When animals sleep for long periods during the winter months
How platypuses detect prey
Points in space where you can find an electric charge
Use their senses to respond to changes in their environment in orders to survive
Animals that sleep in the day and awake at night