Aglacier retreats, exposing bare rock and allowing communities of organisms to move in. this is an example of

primary ecological succession

A glacier retreats exposing bare rock and allowing communities of organisms such as moss and lichens to move in. This is an example of primary ecological succession.

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lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

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