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Astronauts in orbiting satellites are weightless because they are so far from Earth that its gravitational pull is too weak to feel.
Identical Twins
Twins who originate from the same fertilized egg, sharing exactly the same genetic material and often having very similar appearances.
Monozygotic Twins
Twins derived from a single fertilized egg, leading them to be genetically identical.
Senses
Biological systems used by organisms to detect and process sensory information from the environment, including sight, hearing, touch, taste, and smell.
Hearing
The sensory process by which sound waves are detected by the ear and interpreted by the brain.
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