The centre of the reflecting surface of a spherical mirror is a point called the ___.
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One step in the production of hydroelectric power involves _____.
CDM stands for
Short run marginal cost curve cuts the average variable cost curve from _______ at the minimum point of average variable cost.
If at a price, market supply is greater than market demand, we say that there is ________ in the market at that price.
Hydra reproduces by
Which of the following is at the second trophic level of a food chain?
How many bio-geographical zones are there in India?