zeitgebers: are external cues that help maintain
circadian rhythms by synchronising the activity of the bodys organs and glands.
Zeitgeist: refers to the ideas, trends and values that are dominant in a culture at a particular point in history.
zone of proximal development: the distance between a child’s current abilities (when working unaided) and their potential abilities or what are able to achieve under expert guidance.
zygote: a fertilised cell that is produced after a sperm fertilises an egg.
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