PLZ HELP ME Which event was a major source of atmospheric oxygen?

photosynthesis

decomposition of water

volcanic eruptions

outgassing

What is a carrier wave and how does it affect what you hear on the radio

For which pair of objects would adding the same a

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?