Select the word with the correct spelling.
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In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.
The system which is observed to do progress
Alveoli are balloon like structures within the ______.
Which gas contributes most to the Greenhouse effect?
Constantan is alloyed from ...... metals.
SARAS PT1N is how many seater passenger aircraft designed and developed by CSIR-NAL?
Who has recently taken charge as the new CEO of Indian e-commerce giant Flipkart?
What does the slope of a velocity time graph represent?