It comes from the sun. The sun evaporated earth water
Answer:
C.
Explanation:
Hydrogen's pure form is gas at room temperature. Helium is expensive. Hydrogen is lighter than helium.
Answer:
classifying organism
Explanation:
the main criteria for classifying organisms into five kingdoms are complexity of cell structure body organization the mode of nutrition lifestyle and phylogenetic relationship this system consists Monera,protisa,fungi,plantae,amimalia
