Environment
Honeybees welcome friendly migrants to hives but repel raiders
Bees use chemical cues to decide which newcomers to allow into their hive, and become more accepting in times of plenty
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Bees use chemical cues to decide which newcomers to allow into their hive, and become more accepting in times of plenty
High levels of oceanic oxygen could have allowed advanced, animal-like life to develop for the first time – only to be wiped out again as oxygen vanished