Answer:
Sulfuric Acid Droplets
Explanation:
"Venusian clouds are thick and are composed mainly (75–96%) of sulfuric acid droplets. These clouds obscure the surface of Venus from optical imaging, and reflect about 75% of the sunlight that falls on them.
Carbon dioxide: 96.5 %
Sulfur dioxide: 150 ppm
Water vapor: 20 ppm
Carbon monoxide: 17 ppm" by the Wikipedia 
 
        
                    
             
        
        
        
Answer:
Stage 2 - Pre-conditions for take-off  
and  
Stage 3 - Take-off
Explanation:
The stage 2 "Pre-conditions for take-off " give emphasis to the mechanisation of agriculture and trading of agricultural produce. In stage 3 “Take-off” Manufacturing industries get importance. The economy rises with rise in industrial production and trading. The focus is shifted to infrastructure development.
 
        
             
        
        
        
GPS Satellite Constellation: The baseline satellite constellation consists of 24 satellites positioned in six earth-centered orbital planes withfour operation satellites and a spare satellite slot in each orbital plane. The system can support a constellation of up to thirty satellites in orbit.
        
             
        
        
        
From 10th century Andrew patron saint of Scotland. Legends say that his relics were brought by divine guidance from Constantinople.