Question

• When we say trophic interaction, it involves the use of organism such as food by another.
Examples of trophic interactions are herbivory, predation and parasitism.
Non-trophic interaction does not involve eating and being eaten
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Answer 1

Answer:

The cost of a notebook is 10 less than three times the value of a pen. The sum of cost

of pen and notebook is rupees 50. Find the cost of pen and notebook.