During ecological succession,

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(C) : Ecological succession is the gradual and predictable change in the species composition of a given area. It is a natural process where a series o

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the gradual and predictable change in species composition occurs in a given area.

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(C) : Ecological succession is the gradual and predictable change in the species composition of a given area. It is a natural process where a series of biotic communities develop at the same site,one after another,until a climax community is established. The climax community is in near equilibrium with the environment and does not change further. During succession,the number and types of animals and plants increase over time. The establishment of a new biotic community is very slow in its primary phase because it starts on a bare area,whereas it is faster in the secondary phase.

Column-$I$	Column-$II$
$(P)$ First trophic level	$(I)$ Humans,Lion
$(Q)$ Second trophic level	$(II)$ Zooplankton,Grasshopper,Cow
$(R)$ Third trophic level	$(III)$ Phytoplankton,Grass,Trees
$(S)$ Fourth trophic level	$(IV)$ Birds,Fishes,Wolf

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Match the following columns:
Column-$I$ Column-$II$
$(P)$ First trophic level $(I)$ Humans,Lion
$(Q)$ Second trophic level $(II)$ Zooplankton,Grasshopper,Cow
$(R)$ Third trophic level $(III)$ Phytoplankton,Grass,Trees
$(S)$ Fourth trophic level $(IV)$ Birds,Fishes,Wolf

Hydrarch succession refers to ..........

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