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37 million years ago (mya) - Late Eocene Epoch:Species name: DeinosuchusStructural changes: Large and powerful jaws, teeth that can crush bone and armor.New adaptations: The large jaws and crushing teeth helped in preying on large dinosaurs.Geographic/environmental selection differences: They lived in a warm and humid climate near rivers and wetlands.

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37 million years ago (mya) - Late Eocene Epoch:Species name: DeinosuchusStructural changes: Large and powerful jaws, teeth that can crush bone and armor.New adaptations: The large jaws and crushing teeth helped in preying on large dinosaurs.Geographic/environmental selection differences: They lived in a warm and humid climate near rivers and wetlands.

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30 mya - Oligocene Epoch:Species name: Stangerochampsa mccabeiStructural changes: Homologous structures in the skull, snout elongation, jaw and teeth modifications for a more crocodile-like hunting technique.New adaptations: The elongated snout helped them to move quickly in shallow water and catch prey with their modified jaw and teeth.Geographic/environmental selection differences: They lived in a warm and humid climate with a variety of freshwater habitats.

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30 mya - Oligocene Epoch:Species name: Stangerochampsa mccabeiStructural changes: Homologous structures in the skull, snout elongation, jaw and teeth modifications for a more crocodile-like hunting technique.New adaptations: The elongated snout helped them to move quickly in shallow water and catch prey with their modified jaw and teeth.Geographic/environmental selection differences: They lived in a warm and humid climate with a variety of freshwater habitats.

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20 mya - Miocene Epoch:Species name: Alligator prenasalisStructural changes: Vestigial structures in the ear bone and the pelvic girdle.New adaptations: The vestigial ear bone helped in hearing low-frequency sounds underwater, and the pelvic girdle allowed for a more efficient movement on land.Geographic/environmental selection differences: They lived in a warm and humid climate with a wide range of freshwater and swamp habitats.

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20 mya - Miocene Epoch:Species name: Alligator prenasalisStructural changes: Vestigial structures in the ear bone and the pelvic girdle.New adaptations: The vestigial ear bone helped in hearing low-frequency sounds underwater, and the pelvic girdle allowed for a more efficient movement on land.Geographic/environmental selection differences: They lived in a warm and humid climate with a wide range of freshwater and swamp habitats.

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2 mya - Pleistocene Epoch:Species name: Alligator mississippiensisStructural changes: Analogous structures in the eyes and nostrils, enlarged jaw muscles.New adaptations: The analogous structures in the eyes and nostrils helped in seeing and breathing while submerged in water, and the enlarged jaw muscles made them better predators.Geographic/environmental selection differences: They lived in a subtropical to tropical climate in the southeastern United States, with a wide range of freshwater habitats.

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2 mya - Pleistocene Epoch:Species name: Alligator mississippiensisStructural changes: Analogous structures in the eyes and nostrils, enlarged jaw muscles.New adaptations: The analogous structures in the eyes and nostrils helped in seeing and breathing while submerged in water, and the enlarged jaw muscles made them better predators.Geographic/environmental selection differences: They lived in a subtropical to tropical climate in the southeastern United States, with a wide range of freshwater habitats.

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1800s:Structural changes: None.New adaptations: The American alligator was hunted extensively for its skin and meat, leading to a decrease in population.Geographic/environmental selection differences: None.

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1800s:Structural changes: None.New adaptations: The American alligator was hunted extensively for its skin and meat, leading to a decrease in population.Geographic/environmental selection differences: None.

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1967:Structural changes: None.New adaptations: The American alligator was listed as an endangered species, leading to protection and conservation efforts.Geographic/environmental selection differences: None.

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1967:Structural changes: None.New adaptations: The American alligator was listed as an endangered species, leading to protection and conservation efforts.Geographic/environmental selection differences: None.

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1987:Structural changes: None.New adaptations: The American alligator was removed from the endangered species list due to successful conservation efforts.Geographic/environmental selection differences: None.

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1987:Structural changes: None.New adaptations: The American alligator was removed from the endangered species list due to successful conservation efforts.Geographic/environmental selection differences: None.

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Present day:Structural changes: None.New adaptations: The American alligator is well adapted to its environment and faces few natural predators.Geographic/environmental selection differences: The American alligator continues to face threats from habitat loss, pollution, and climate change.

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Present day:Structural changes: None.New adaptations: The American alligator is well adapted to its environment and faces few natural predators.Geographic/environmental selection differences: The American alligator continues to face threats from habitat loss, pollution, and climate change.

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Future hypothesis:The American alligator will likely face increased pressure from climate change, which will lead to habitat loss and changes in the ecosystems they rely on. They may need to adapt to new environmental conditions, such as changes in water temperature and availability, in order to survive.

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Future hypothesis:The American alligator will likely face increased pressure from climate change, which will lead to habitat loss and changes in the ecosystems they rely on. They may need to adapt to new environmental conditions, such as changes in water temperature and availability, in order to survive.

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Adaptations for survival:Possible adaptations for the American alligator to survive in the face of climate change include changes in behavior, such as shifting their nesting habits to adapt to changes in water levels, and physiological changes, such as increasing their tolerance to higher water temperatures. Natural selection may play a role in selecting for individuals with these adaptations, which will increase the likelihood of their survival and success in the face of changing environmental conditions.

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Adaptations for survival:Possible adaptations for the American alligator to survive in the face of climate change include changes in behavior, such as shifting their nesting habits to adapt to changes in water levels, and physiological changes, such as increasing their tolerance to higher water temperatures. Natural selection may play a role in selecting for individuals with these adaptations, which will increase the likelihood of their survival and success in the face of changing environmental conditions.