What happens to sparrows that don't learn their song during the critical period?
They must wait and learn the song one month later.
The sparrows have lost their chance to ever fully learn their song,
They must rely on adult sparrows to teach them the song for several extra months,
All statements are true.

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.

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