A) A metal forms a + charged ion, so D2+
B) A nonmetal forms a - charged ion, so A-
C) C2-
D) B+
 
        
             
        
        
        
Answer:
Earth's upper atmosphere controls the radiation that escapes to space.
(please give brainliest)
 
        
             
        
        
        
the enzymes joins to synthesize anew DNA
Explanation:
because each new DNA molecules is made of one good original new strand
 
        
             
        
        
        
Answer:
Paleontologists study fossils so that we can understand the evolution's from past species to the current ones. It also opens a window to discovering exactly how long earth has been around by finding out the age of the fossil itself. Though paleontology has been in the decline recently, and i'm sure we haven't found out all we need to know from these fossils. 
Explanation: