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Biology

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Brainchild: 5 Stages of Sleep thumbnail 01:39
The body goes through five different stages of sleep- the stages constantly repeat throughout the night. This video explains what happens during each stage.
Brainchild: 5 Stages of Sleep
Anatomy
Biology
sleep cycle
Penguin Rescue: About Orcas thumbnail 02:36
The team learns about orcas, how they hunt and communicate, and their diet.
Penguin Rescue: About Orcas
Biology
Zoology
animal navigation