An echidna is a monotreme (egg-laying mammal) along with the platypus. It uses lungs and breathes in air to obtain oxygen just like people.
Our body obtain oxygen to our body by breathing.
Crustaceans obtain oxygen through gills.
Who is "they" ?
you obtain oxygen from your lungs you could breath through your nose and through your mouth
multicellular organisms obtain their oxygen through the respiratory system
We obtain oxygen by breathing in fresh air. Carbon dioxide comes out of us.
No. The skeleton dose not get oxygen
Pterodactyls do not obtain oxygen at this time because they are extinct. While they existed, they probably obtained oxygen in the same way that birds today obtain it through the use of lungs.
Plants obtain oxygen during photosynthesis from water molecules.
They absorb the oxygen from the cell which gets its oxygen from the blood
Breathing
By breathing.