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.
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The provided question is incomplete as the image is not given, however the correct image is attached.
Answer:
The correct answer is - embryo.
Explanation:
Angiosperms form embryos by the fertilization of pollen and ovule which are haploid structure and form diploid in the structure. It is also known as the seed embryo.
It is the structure that contain early life form of the plant which is root, leaves and stem.In this image pointer is showing the diploid or 2n structure which is embryo of the plant.
Thus, the correct answer is - embryo.
