Manchester peppered moth dark form soot Clean Air Act

Dark peppered moths became common and then became rare again

During the Industrial Revolution, soot darkened trees around Manchester. Dark peppered moths became harder for predators to see and grew very common. After air pollution fell and trees became lighter again, dark moths became rare.

Greek cities had to work together to defeat Persia

Greek victory over the much larger Persian Empire depended on alliances between city-states. They shared resources and split military jobs among themselves in ways that no single Greek city could have managed alone.

Red Sea species moved into the Mediterranean

>1,000 Marine Species

Since the Suez Canal opened in 1869, more than 1,000 marine species from the Red Sea have moved north and settled in the Mediterranean. Some now make up a significant part of its ecosystem.

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Manchester peppered moth dark form soot Clean Air Act

Dark peppered moths became common and then became rare again

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