They contain symbiotic bacteria called rhizobia within nodules in their root systems, producing nitrogen compounds that help the plant to grow and compete with other plants. When the plant dies, the fixed nitrogen is released, making it available to other plants; this helps to fertilize the soil.
 
        
                    
             
        
        
        
Answer:
Carbohydrates may be defined as the polymers of the sugars and one of the most important biomolecule of the living organisms. Carbohydrates plays an important structural and functional role.
Carbohydrates are always present on the exoplasmic surface of the plasma membrane. The are present in the association with the proteins and lipids as glycoproteins and glycolipids. These carbohydrates acts as the signaling molecule that display information on cell surface.
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Answer:
Fermentation
Explanation:
To find the correct answer, we will review over the definition of each answer choice.
Photosystem I is A membrane in a plant that produces high levels energy from light
Based on the definition, we can conclude that photosystem 1 is not the correct answer.
ATP Synthase are molecules that create ATP
We know that this answer choice is also not correct.
Glycolysis is the process of breaking down glucose to create energy.
Based on the definition provided we know that this answer choice is also incorrect
Fermentation is the process of lactic acid being formed when there is not enough oxygen present for cellular respiration to take place.
Therefore, fermentation is the correct term we are looking for. 
 
        
             
        
        
        
Answer:
D
Explanation:
The atmosphere is not an eycosystem
 
        
             
        
        
        
Biodiversity is essential to an ecosystem's resistance against viruses and famine. In history, there has been many cases in which a lack of biodiversity has allowed a virus or disease to endemically wipe out an entire species of plant. This will subsequently affect all consumers of each trophic level. Ex: A disease that attacks the DNA of only one certain species of plant would cause decreases in the population of the organisms that rely on eating that plant, the organisms that rely on eating those organisms, and so on. This is caused by a decrease in food source, thus not being able to sustain the ecosystem's demand, thus naturally killing off any organisms that would not be able to find a sufficient food source.