Answer:
A.) Prophase I
Explanation:
Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I. By meiosis II, only sister chromatids remain and homologous chromosomes have been moved to separate cells. 
 
        
             
        
        
        
Answer:
the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
Explanation:
Your welcome! :)
 
        
             
        
        
        
Biofuel, which is chemical energy taken from biodegraded material.
        
             
        
        
        
Answer:
1st Activity = Cold Front
2nd= High Pressure with a Cold Front
 
        
             
        
        
        
The answer is density independent