When it rains the water that falls is the earth ​

Not sure what to put exactly in the blank but rainwater either flows into streams or rivers, or they get soaked into the ground and become groundwater.

Tolerance to high levels of salinity

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