As they decompose organic material, some bacteria release sticky substances that cause small soil particles to stick together in larger loosely packed clumps. These bacteria help prevent erosion by

i believe the answer is a or 1

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.

explanation:

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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c.           is the correct answer