In "Rivet popper hypothesis " Paul Ebrlich ,the rivets on the wings represents __________ in ecosystem.</h2…

Weathering of rocks makes phosphorus available to first<span><br> </span></h2></div>

Briefly explain the ecological pyramid which is always upright. </h2></div>

State whether the following statements are true or false.<span><br> Clements called the first stage…

By what letter is the gross primary productivity designated?

Biogeochemical cycles are also known as</h2></div>

Which biogenetic element is obtained from crystalline rocks?

What is the rate of biomass production called?