How do the oxygen (O2) and carbon dioxide (CO2) levels change over time? What is always true about the total amount of O2 and CO2 in the test tube?
What happens when the CO2 reaches zero?

Which contributions did galileo make to the model of the solar system? check all that apply. a mathematical model for the orbits of the planets scientifically accurate data on planetary orbits data that showed that planets reflected sunlight similar to earth's moon up the idea that stars are other suns that do not move u observations of the moons of jupiter rotating around the gas giant