Answer:
d.The wing-assisted incline running theory postulates that wings were initially used to maintain balance while climbing up slopes.
Explanation:
Two theories were given to explain the origin of avian flight. The top-down theory suggested that the birds' ancestors were tree dwelling species. They took help of wings to glide from tree to tree in order to avoid predator or catch prey. The bottom up theory suggested that the birds' ancestors were ground dwelling species. They took help of wings to maintain a balance and provide a lift for efficient running.
Wing-assisted incline running was a mixture of both the above theories and gave a balanced view point. According to it, birds' ancestors used wings to maintain a balance while running up inclined slopes. The wings helped them to save energy while scaling slopes and eventually a flight mechanism was also developed.
Circadian rhythms ....its just behavior that is repeated over 24 hours
The answer is D. Instinct
Eagles evolved better over the years to hunt their targets easier, which explains why they have sharp talons, they instinctively use them to hunt their prey.
<span>The area was most likely eroded by a earthquake. Feel free to message me if you have any other questions.
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