The answer is photosynthesis.
<span>Photosynthesis
occurs in the leaves of green plants. During photosynthesis, carbon
dioxide and water are converted into using the energy of
sunlight to glucose and oxygen. After great evolution of plants, the photosynthetic rate was increased. More plants mean more oxygen produced in the process of photosynthesis. Thus, photosynthesis </span><span> is most responsible for the increase in early Earth’s atmospheric oxygen levels.</span>
 
        
                    
             
        
        
        
Answer: 1
Explanation: Simple sugars are not formed during cellular respiration.
 
        
             
        
        
        
Answer:
Qualitative
Explanation:
There's two kinds of observation in the scientific method: quantitative and qualitative.
Quantitative is like physical measurement, actual numbers and such. Such as height, weight, etc.
Qualitative is like color, descriptions, shape etc.
Therefore, I think answer should be Qualitative.
 
        
             
        
        
        
Answer:
The post-transcriptional modifications in the mRNA produced as a result of the transcription in eukaryotes provide many advantages to the mRNA.
The two post-transcriptional modifications are the addition of  7-methylguanosine cap at 5' end of mRNA called capping whereas the addition of the poly(Adenyl) tail at 3' end called tailing.
The advantages of capping are:
1. Protection of nascent mRNA from the degradation.
2. Recognition by transcription factors helps in translation.
The advantages of tailing are:
1. Protection of the mRNA from enzymatic degradation in the cytosol.
2. Transcription termination
3. Export of the mRNA from the nucleus  
 
        
             
        
        
        
The answer should be B Convection