Question

Please select the word from the list that best fits the definition

makes up 21 percent of the atmosphere

Answer 1

oxygen makes up 21 percent of the atmosphere

Answer 2

Answer:

Oxygen makes up 21 percent of the atmosphere of the earth. Oxygen is a chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table, and is a highly reactive non-metal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. We breathe oxygen.