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Refers to medium or nutrient solution with a low pH; an acidic solution has a pH below 7.

Filament-shaped bacteria involved in the decomposition of organic matter.

A process of supplying soil and roots with air or oxygen.

Process that requires oxygen.

any organism or living thing with an oxygen-based metabolism

Refers to medium or nutrient solution with a high pH; any pH over 7 is considered alkaline.

Without oxygen

Plants that germinate, grow, set seeds and dies in a single growing season. 

A single-celled soil dwelling organism.