Carbon hydrogen and oxygen.
Have a good night! 
        
             
        
        
        
Asteroid impact
Volcanic eruptions
Explanation:
Asteroid impact and volcanic eruptions are two common events that could lead to a mass extinction. 
A mass extinction is an abrupt decrease in life on earth due some catastrophic event. 
- The collision of a large bolide on the surface of the earth is a catastrophe in itself. 
- The collision and its aftermath have destructive consequences on life. 
- The force of the collision can reverberate in form of vibration throughout the earth. 
- It can cause heating of the earth surface. 
- Volcanic eruptions can become global phenomenon that upsets the earth balance. 
Learn more: 
Extinction brainly.com/question/10860460
#learnwithBrainly 
 
        
             
        
        
        
it is D on my point of veiw..
 
        
             
        
        
        
Answer:
T T A G C C G T A A T G   is the complementary DNA strand.
Explanation:
A=T  G=C  C=G  T=A
this is the key to all DNA complementary strands.
(not sure what the "O" was at the end but- it's ok)
Hope this helps! :)
 
        
             
        
        
        
Answer:
48g
Explanation:
Volume of rock=16cm^3 (1 ml=1 cm^3)
Density=3 g/cm^3
Mass=?
d=m/v
3g/cm^3=m/16cm^3 
3g/cm^3*16cm^3 =m
Therefore, m= 48g