What was the most extensive and destructive alteration to this ecosystem

 Unnatural occurrences

Explanation:

Unnatural occurrences, can have the MOST significant impact on any ecosystem. Energy moves through the plants and the animals in an ecosystem.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.