Its c after the meteorite hit earth it created a different environment worldwide that animals weren't able to adapt to due to its harsh conditions 
        
                    
             
        
        
        
Answer:

Explanation:
Radius of the pollen is given as

Volume of the pollen is given as



mass of the pollen is given as


so weight of the pollen is given as



Now electric force on the pollen is given



now ratio of electric force and weight is given as


 
        
             
        
        
        
<h2>
Answer: 0.17</h2>
Explanation:
The Stefan-Boltzmann law establishes that a black body (an ideal body that absorbs or emits all the radiation that incides on it) "emits thermal radiation with a total hemispheric emissive power proportional to the fourth power of its temperature":  
 (1)
 (1)  
Where:  
 is the energy radiated by a blackbody radiator per second, per unit area (in Watts). Knowing
 is the energy radiated by a blackbody radiator per second, per unit area (in Watts). Knowing 
 is the Stefan-Boltzmann's constant.
 is the Stefan-Boltzmann's constant.  
 is the Surface area of the body
 is the Surface area of the body  
 is the effective temperature of the body (its surface absolute temperature) in Kelvin.
 is the effective temperature of the body (its surface absolute temperature) in Kelvin.
However, there is no ideal black body (ideal radiator) although the radiation of stars like our Sun is quite close.  So, in the case of this body, we will use the Stefan-Boltzmann law for real radiator bodies: 
 (2)
 (2)  
Where  is the body's emissivity
 is the body's emissivity 
(the value we want to find)
Isolating  from (2):
 from (2):
 (3)
 (3)  
Solving:
 (4)
 (4)  
Finally:
 (5)  This is the body's emissivity
 (5)  This is the body's emissivity
 
        
        
        
300/8 = 37.5
37.5 x 12 = 450
New temp. = 450 K
Hope this helps!