Other contributors have said "What are some facts on molybdenum?" is the same question as "What are the uses for Molybdenum?" If you believe that these are not asking the same thing and should be answered differently, click here
Using " Has " is referred a past tense. Such as: He has taken the garbage out already. Using " Is " for example is referred a Present tense. Such as: He is taking out the garbage.
You use "in" when you mean "in" and you use "or" when you need to use "or". It is rather difficult to construct rules for the use of prepositions in most languages.The grammatical structure of the...