Succession proceeds from

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(D) Ecological succession is the process by which the structure of a biological community evolves over time. In both primary and secondary succession,

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(D) Ecological succession is the process by which the structure of a biological community evolves over time. In both primary and secondary succession,the community moves towards a stable climax community. Succession occurring in dry areas (xeric) and succession occurring in water bodies (hydric) both eventually lead to a balanced environment with moderate moisture,known as mesic conditions. Therefore,both xeric to mesic and hydric to mesic are correct pathways for succession.

List-$I$	List-$II$
$a$. Carbon dissolved in oceans	$i$. $55$ billion tons
$b$. Annual fixation of carbon through photosynthesis	$ii$. $71 \%$
$c$. $PAR$ captured by plants	$iii$. $4 \times 10^{13} \ kg$
$d$. Productivity of oceans	$iv$. $2$ to $10 \%$

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