Thw answer is PHj78 JJ CP30 R2D2
        
             
        
        
        
Answer:
See Explanation
Explanation:
According to the question, it is established that the pain caused by a lot of insect bites owes to the acidity of the insect bites.
 If this is true, then there is an urgent need to neutralize the acidic insect bite using a basic substance.
Hence the pH of the creams used to treat insect bites should be basic(having a high pH).
2. The compound methene can not exist because it is supposed to be derived from the alkane called methane which contains only one carbon atom.
In order to form an alkene, there must be a double bond between two carbon atoms. This is not possible because there is only one carbon atom in the hypothetical methene. Hence,  a compound named methene cannot exist. 
 
        
             
        
        
        
Stainless steel is an alloy of iron, chromium and nickel.
        
                    
             
        
        
        
- Calcium carbonate is the  salt  among the given options.
- Calcium carbonate ( CaCO3) can be regarded as  which appears as white and odorless powder or  as a colorless crystals it is  insoluble in water. 
- The chemical  formula is  CaCO3. It can be used as an antacid as well as food colouring and a  food firming agent and a fertilizer. 
- Calcium carbonate is calcium salt as well as  carbonate salt with one-carbon compound
- Salt can be regarded as substance which is  produced by reaction between acid and  base. It  consists negative ion (anion) of that acid as well as positive ion (cation) of the base.
- Sodium hydroxide is a base and not a salt
- Carbonic acid is an acid and not a salt
- Therefore, calcium carbonate is the only salt in the among the given options.
Learn more at ; brainly.com/question/14091731?referrer=searchResults
 
        
             
        
        
        
the answer is A.) the moon is orbiting the earth once per month
its the only logical answer, the others are either impossible or illogical