How is oxygen recycled in a Terrarium?

Question

I really want to know

Answer 1

WEll it is not like it is sealed air tight so air can still travel though the Terrarioum

Answer 2

Plants breathe in oxygen and breath out carbon during the night and opposite during the day.

Answer 3

Teranium is sealed so if it is not recycled the plants would die.

The reason this is possible because plant take in Carbon Dioxide in the day time and give out oxygen but at night they take, oxygen just like most animals like us and give out Carbon Dioxide. So the oxygen is recycled by the plant during day time by a process called Photosynthesis.

Even the water from the soil is retuned to the soil by transmission, as the plant transpires, all the time.