The ozone layer is important because it protects life from damaging ultraviolet radiation. how did early life create the ozone layer?
a) water molecules on the earth were broken to release ozone.
b) volcanoes released the carbon dioxide needed to make ozone.
c) early bacteria and plants released the oxygen needed to make ozone.
d) early bacteria and plants released the carbon dioxide needed to make ozone.

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.

Which is an example of a vestigial structure? a: paw of a lionb: wing of a birdc: appendix of a humand: tail of a cat(i think it's a but i'm not sure)