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1. In a laboratory a student observed that a plant and its parts continued to grow every day as a noticeable change. When he asked his teacher about it, the teacher told him that the plant has a vital force that is responsible for this. The explanation of the teacher was based on?
2. The ancestors of ostrich were flying birds. But due to the favourable environmental conditions ostriches stopped flying and thereby stopped using their wings. Hence wings became vestigial in ostriches. This is explained by
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