Mission: SPACE simulates astronaut training! What element needs to be in the air to breathe?

Keep practicing — related questions

• The air we breathe consists ____ nitrogen, oxygen, carbon dioxide, and several other gases.
• Breathing gives out carbon-di-oxide and takes in ____
• Which of the following is an element?
• In order for life as we know it to exist, a planet's atmosphere must contain ____________.
• The main element in the Earth's atmosphere is ____________.
• Air contains ____________.
• The inactive component of the air is
• You need to store elements in a collection that guarantees that no duplicates are stored. Which one of the ...