why does our nose get stuffy when we have a cold
Answer:
Due to dilation of blood vessels in the sinuses of the nose
Explanation:
Often times, we think our nose gets stuffed up due to the excess mucus in times of cold but it is not always so. 
We get stuffed due to the body's homeostasis, a drive to internally control and balance the outside environment. 
- During cold, blood vessels dilate so as to allow for more inflow of blood. 
- Incoming blood brings in more heat to the body parts. 
 
        
             
        
        
        
do u mean microbial symbiosis?
Answer:
Symbiosis is a relationship between two organisms
Types of Interactions
Positive interaction: Mutualism, Syntrophism, Proto-cooperation, Commensalism
Negative interaction: Ammensalism (antagonism), parasitism, predation
 
        
             
        
        
        
Deforestation 
Factories that release carbon dioxide and other greenhouse gasses 
Peat bog destruction 
Burning fossil fuels
Power plants usagr
        
             
        
        
        
<span>I believe it is because, convection currents are increased by the latent energy of condensation. 
I hope this helps!</span>