Why is it necessary to begin this experiment with buds in which petals are closed ?
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make one's way quickly or awkwardly up a steep gradient or over rough ground by using one's hands as well as one's feet
make one's way quickly or awkwardly up a steep gradient or over rough ground by using one's hands as well as one's feet｡◕‿◕｡◉‿◉ʘ‿ʘ
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It is necessary in mammals and birds to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature
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