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Antibiotic resistance in bacteria is a clear example of evolution in action. When antibiotics are introduced, most bacteria die.

A green leaf. A green leaf. A green leaf. A green leaf. A green leaf. A green leaf. A green leaf. A green leaf. A green leaf. A green leaf. A green leaf. A green leaf. A green leaf. A green leaf.
Butterfly 1 - Stationary
Butterfly 2 - Stationary
Butterfly 2 - Stationary
Butterfly 3 - Stationary