What does the pyramid of number and pyramid of biomass represent?

What does the following pyramid represent?

Which of the subsequent pyramid can either be upright or inverted?

Who replaces the herbaceous plants in a xerarch succession?

In primary succession on rocks, the pioneer species are usually</h2></div>

Flg can maintain community structure during food scarcity in tropical deciduous forest these are act as:</h2></…

Differentiate between "Pioneer-species"; 'Climax-community" and "Seres".</h2></div>

What does the following pyramid represent?