Answer:
The correct answer is option energy is a product.
Explanation:
Cellular respiration is a process in which oxidation of food or glucose takes place to produce energy. This process proceeds in four processes: glycolysis, oxidative carboxylation, Krebs cycle and electron transport chain.
All of this process produces energy in the form of ATP or energy equivalents like NADH and FADH₂.  
1. Glycolysis produces- 2 ATP, 2 NADH,  
2. Oxidative carboxylation produces- 2 NADH,  
3. Krebs cycle produces- 2 ATP, 6 NADH AND 2 FADH₂ and  
4. Electron transport chain produces at last- 24 ATP from these reducing equivalents.
Thus, option energy is a product is a correct option.
 
        
             
        
        
        
The answer is; glycolysis
This process converts glucose molecule to pyruvate. It is an oxygen-independent pathway, unlike the Krebs cycle. Glycolysis occurs in the cell cytoplasm while the Krebs cycle (aerobic pathway) occurs in the mitochondria. In the presence of oxygen, the product of glycolysis, i.e pyruvate, is fed to the Krebs cycle.  If oxygen is unavailable the pyruvate is converted to lactate.
 
        
             
        
        
        
Correct answer: False
A primary source provide the first hand proof and the original information of the event, object, person or work. 
Example: Research data, e.g. public opinion polls, speech
Secondary source is that source of information that is not performed or collected by the individual but it is taken from old information. It is updated by someone who is not participation in the event or the research.
Example:  Library, ebook, reviews.
 
        
             
        
        
        
Immature seed cones of conifers are usually green before pollination, and flowers of grasses are inconspicuously colored. What does this indicate about their pollination? they are wind pollinated.