Do you see animals suffocating by the thousands? Then yes, there is.
For food and, like all mammals, for the oxygen they produce world wide.
Animals do not use up all the oxygen in the atmosphere because plants produce oxygen. When they breathe, plants inhale carbon dioxide (which is what animals breathe out) and exhale oxygen (which is what animals breathe in).
Yes. All animals require oxygen.
No. They breath in oxygen, like all animals.
Yes they do. All animals need oxygen.
All animals absorb oxygen and produce CO2 during respiration
many land animals get oxygen by breathing air into their lungs,like you do .but not all animals get oxygen this way. different structures for getting oxygen.
yes, all insects breath oxygen in and carbon dioxide out (as do all animals)
All animals need oxygen to live.
the world will perish because we won't have enough oxygen to breathe no protection from direct sunlight
Humans ARE animals. All animals breath oxygen, so all animals would be in trouble in space (unprotected).
All animals and plants. Plants use oxygen as well as carbon dioxide.