The answer is 3). This is because elements are the simplest form of a substance, and cannot be broken down any further. Compounds on the other hand are much more complex than elements and can be broken down INTO elements.
For example, Na, sodium, is an element and cannot be broken down further. H2O, water, is a compound and can be broken down into Hydrogen and Oxygen.
Answer:
we have lots of bikes and i think that we could improve them to be portable scooters. we also have buses and i think that we should change them to subways to prevent all the pollution. Also i think cars should be less polluted in the future
Explanation: hope this is an okay answer.
NH3 is a gas at room temperature. Solutions of "ammonia" are made by bubbling NH3 through water, so there's no "pure ammonia" unless you are talking about the gas.
