- monogamy
- polygamy
- polyandry
- ovovivipary
Author: Zabeehullah
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- amphibians
- reptiles
- birds
- mammals
- Gas exchange occurs in blind-ending sacs called alveoli
- Abdominal and thoracic air sacs are compressed by body muscles to move air through the respiratory system
- Two respiratory cycles are required to move a volume of air through the respiratory system
- Birds have a greater rate of oxygen consumption than any other vertebrate.
- epidermis
- dermis
- hypodermis
- basement membrane
- Archaeopteryx
- Sinoris
- Eoalulavis
- Sterna
- incisors
- canines
- premolars
- molars
- 4 to 9×1013 Kg
- 4 to 9×1017 Kg
- 4 to 9×1023 Kg
- 4 to 9×1027 Kg
- Water Cycle
- Chemical cycle
- Biospheric Cycle
- Mineral Cycle
- pygostyle
- ucinate process
- synsacrum
- furcula
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