<span>A stem is one of two main structural axes of a vascular plant. The stem is normally divided into nodes and internodes, the nodes hold buds which grow into one or more leaves, inflorescence (flowers), cones or other stems etc. The internodes act as spaces that distance one node from another.</span>
        
             
        
        
        
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Community, also called biological community, in biology, an interacting group of various species in a common location. For example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes a biological community.
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Homeostasis refers to the ability of the body or a cell to seek and maintain a condition of equilibrium or stability within its internal environment when dealing with external changes. It is involved in the maintenance of the constant internal environment which includes the function of kidney, liver, skin, etc.
Explanation:
https://www.biology-online.org/dictionary/Homeostasis
 
        
                    
             
        
        
        
Cellular respiration will affect the oxygen levels by decreasing it. 
CELLULAR RESPIRATION:
- Cellular respiration is the process by which living organisms obtain energy (ATP) by breaking down food molecules in their cells. 
- Cellular respiration can either occur aerobically (with oxygen) or anaerobically (without oxygen). Aerobic cellular respiration uses oxygen to break down glucose molecules to form carbon dioxide and water as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O
- Based on the equation above, oxygen is a reactant meaning that it is used up during the cellular respiration process. Therefore, oxygen levels will decrease due to cellular respiration. 
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