They are autotrophs that go through photosynthesis. Have no true, roots, stems or leaves.
        
             
        
        
        
Answer:
On April 13, 2029, Apoptosis will pass Earth closer than geosynchronous communication satellites, but will come no closer than 31,200 kilometres (19,400 mi) above Earth's surface.
Explanation:
 
        
             
        
        
        
Answer:
Burried in protein
Explanation:
Leucine have a branched hydrocarbon side chain. The side chain of leucine is nonpolar and hydrophobic.
 If a protein have to face water, proteins fold in such a way during the tertiary structure that the amino acid with polar characteristics tend to remain on outer surface while amino acid with nonpolar characteristics tend to remain in the core of protein. 
So Leucine side chain would be found burried in core of protein.
 
        
             
        
        
        
Natural selection it has to be 20 characters so disreguard the rest