How are zip lines similar to and different from roller coasters?

Zip lines have drops and you have to be harnessed in. The same is with roller coasters. I hope this helps.

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom