When a plant is left in dark for several hours, it does not get sunlight. Isn't it?
When a plant does not get sunlight, it cannot prepare food for itself , i.e, photosynthesis does not take place. When it does not prepare food in the form of starch, it will test negative for it.
hope it helps!
        
             
        
        
        
Answer:
The continents were once connected as one landmass. 
Explanation:
This did happen it's called Pangea. There were similar fossil records in different continents. 
 
        
             
        
        
        
Pepsinogen, a digestive enzyme ,is secreted by the  chief cells in the gastric mucosa.
        
             
        
        
        
Answer:
Biodiversity is a major factor in terrestrial regions. true
Cold, hot, wet and dry are factors that contribute to climate 
false
Cloud cover, precipitation and deserts are elements that contribute to weather
True
Trade winds blow easterly and northern 
True
 
        
             
        
        
        
Answer:
I think it is maybe running a marathon, but Google will be your friend I believe to check that.