It indicates that the river water is very good quality with nutrients and minerals to support an ecosystem.
Answer:
Magnesium,Berillium,
Explanation:
they they belong to group II
Intensive properties are the properties which values doesnt change with the amount of mass or material that you have, example density, melting point boiling point, molecular mass
Extensive are properties that depends of how much mass or material you have. Example: mass, number of moles, volume, pressure, number of students, population,
mass, volume, quantity (there is only one of each), color, reflect light, temperature, energy
