Answer: 30 years
Explanation: what is 30 plus 30... 60 it says he died in 1930 and discoverd the thing in 1960  add 30 boom its been 30 years
 
        
             
        
        
        
Answer:
Bubbles are nothing but the oxygen which arise around the green parts of the plant. 
 
        
             
        
        
        
Answer:
animals will use sound, colors, and stance. Another way would be by leaving their imprint or mark on their territory. For example a dog peeing on an area they used. 
Explanation:
Hope this helps!! :)
 
        
             
        
        
        
Answer:
A. The cryosphere is part of the hydrosphere
Explanation:
hope it helps :)
Brainliest pls? Have a good day/night
 
        
                    
             
        
        
        
Answer:
Disadvantages.
Explanation:
A big disadvantage of sexual reproduction is that the process is much slower than asexual reproduction. For starters, the cell division, which is meiosis, is more complex and has more stages than mitosis.