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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Synesthesia
Snakes use their tongue to detect smell in thier environment. Would this be considered as a form of synesthesia? If it is, then I wonder if the phenomenon of synesthesia was a result of humans inheriting vestigial neural connections. There may be some more animals capable of using one sense to stimulate another and these neural connections responsible for such phenomenon may have been passed onto various species as organisms evolved over time.