Biology, 20.11.2020 01:00, devinb18

Many sidewalks have areas that are uneven or even completely broken. This is usually caused by: A)tree roots wedging underneath.
B)lichen living on the surface.
C)oxidation of the cement due to oxygen.
D)contact with other rocks.

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Many sidewalks have areas that are uneven or even completely broken. This is usually caused by: A)t...