The fossil record shows that the average size of black bears was large during cold glacial periods and got smaller during warmer time periods. what is this an example of?
directional selection
disruptive selection
sexual selection
stabilizing selection

This is a directional selection: when the selection causes the whole species to shift its characteristics.

Disruptive selection would create more variability (very small and very large bears) and stabilizing selection would favour middle-sized bears.

Its directional selection because Directional selection creates more variability & Stabilizing selection would favour middle sized bears

idk but if i had to take an educated guess i’d say a c d

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