Aves have air sacs connected to lungs for supplementary respiration. Sexes are separate, fertilization is internal, they are oviparous, and development is direct.
Aves have air sacs connected to lungs for supplementary respiration. Sexes are separate, fertilization is internal, they are oviparous, and development is direct.
| Text | Air sacs connected to lungs in aves for supplement respiration. Sexes are separate. Fertilisation is internal. They are oviparous and development is direct. |
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