belaltheog belaltheog
  • 16-06-2020
  • Biology
contestada

Please help with this question

Please help with this question class=

Respuesta :

justinabettyo justinabettyo
  • 16-06-2020

Answer:

Explanation:

birds need  large efficient hearts and air sacs connected to lungs  to make use of oxygen to help them fly

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