If X is another angle, keep in mind that when the figure is a triangle the sum of the angles is 180º (angle1+angle2+angle3=180º) ALWAYS!!
<span>The ecological pyramid is the smallest at the top beacuse there is ten percent loss of energy, in the form of food, at each trophic level, and the number of organisms of the top most level are the fewest. </span>
I believe that is mistral.
Explanation:
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