If want a direct answer it would be the decrease in mice, but if you want to get technical the decrease in grain spills caused mice to leave so that would be the indirect cause
When coming to building something, some materials are more vulnerable to water and can wear away easier. Some can keep the water in, so depending on the material, the water quality can be better sustained.
The answer is because biology is easy and they're known around the world.
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The
zebrafish lineage is the studied gene who evolved most rapidly as shown in its
branch where it manifest to have the longest lineages.<span> The changing branch lengths indicates
that the gene has evolved at different rates in each lineages and the branch length
is proportional to amount of the genetic variation in each linear.</span>
