Trees, like other green plants, are net users of Carbon Dioxide, which they metabolise to help build the cellulose that provides their structure, releasing oxygen into the atmosphere as a result.
Wide range of answers and easier clues.
“Wall Coverings”
Things used to cover the building-material of a wall.
“Rock and Pop Bands: C”
Bands beginning with “C”. No solo artists or duos. Those with “The…” starting the name will appear later in a “The…” series. Groups of singers are included.