Geographic variation was the study or examination that living things which are relatively similar are different because of their habitat and geography was dissimilar. Comparable organisms parted ways by physical features and global positioning.
It depends on the position of the species a cline can happen. This can relate to a specific one of two or more substitute forms of a genetic factor that arise by transformation and are found at the same place on a chromosome which will assist in surviving of a different but reachable geographic location.
Using trees to control erosion
Trees are often considered to be the universal answer to control soil erosion. Tree roots help prevent landslides on steep slopes and stream bank erosion but they don’t stop erosion on moderately sloping hill slopes.
In forests, the soil surface is usually protected by a layer of mulch from decaying vegetation as well as a variety of surface growing plants. If the soil is bare under the tree canopy from over grazing, vehicles or pedestrians, soil erosion will still occur.
From my prior knowledge it’s smuggling things like drugs and guns from the border so it made it hard for those to move to the u.s
Sorry if this doesn’t help
2.<span>Coal came from swampy environments, while oil and natural gas came from open ocean environments.</span>
The sun was the center of the universe