Fill in the blanks and choose the correct option given below.

(i) The entire sequence of communities that successively change in a given area are called .

(ii) The ecological succession in a place where there no living organism ever existed is called succession and in a place which lost all living organism that existed there is called succession.

(iii) succession takes place in wetter areas and succesion in dry areas. Both successionlead to medium water condition called .

(iv) The species that invade a bare area are called species. In primary succession on rocks these are usually and in water these are usually .

(v) The amount of nutrients present in the soil at any given time is reffered to as .

(vi) Another name of nutrient cyclic is cycles.

(vii) The reservoir for gaseous type of nutrient cycle is and for the sedimentary cycle is .

(viii) Carbon constitutes % of dry weight of organism.

(ix) The products of ecosystem processes are named as .

(x) and his colleagues have tried to put price tags on nature life-support services and is estimated to be a year.