In the following question, four words are given out of which one word is correctly spelt. Select the correctly spelt word.
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______ are details of appearance or behavior or in other words, a particular form or a particular function in classification of organisms.
Which of the following is a commercial source of energy?
The elements known as primary nutrients for plants
Atomic number of which of the following elements is greater than that of Calcium?
Which of the following is used in gunpowder?