Hey there friend!
Electrons come from atoms. 
Hope this helps!
 
        
                    
             
        
        
        
Answer: Organisms depend on other organisms and on the nonliving things in an ecosystem to meet their basic needs for food, water and protection. 3. Plants use energy from the sun to produce their own food from air and water.
Explanation:
 
        
                    
             
        
        
        
For the second one it’s B or C, I dunno if phototropism is a real word cuz all the rest are vital. 
 
        
             
        
        
        
Answer:
The equation to this question is unclear. The clear equation is:
CH4 + 2O2 → CO2 + 2H2O
Please find the number of atoms of each element on the reactant and product side below.
Explanation:
An atom is the smallest indivisible part of an element. The atom retains the chemical properties of the chemical element. In order to ensure that a chemical reaction between molecules and compounds is BALANCED, the number of atoms of each element that makes up the molecule/compound must be the same on both the reactants and products side. 
In this case, the chemical reaction involves:
 CH4 + 2O2 → CO2 + 2H2O
1. Carbon atom (C): 
Reactants side = 1 atom 
Products side = 1 atom
2. Oxygen atom (O):
Reactants side = 4 atoms 
Products side = 4 atoms
3. Hydrogen atom (H):
Reactants side = 4 atoms
Products side = 4 atoms