The molecule drawn below is an example of ________ 
Definitions:
Soil Acidity
The measure of hydrogen ion concentration in soil, affecting nutrient availability and plant growth.
Pine Needles
The slender, pointed leaves of pine trees, adapted to conserve water.
Secondary Succession
The process of ecological recovery and species replacement that occurs in an area where a biological community has been partially or entirely removed.
Bare Rock
Exposed rock surfaces without any vegetation, soil, or biological activity visible on them.
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