Match List-I (Scholar) with List-II (Concept or term) and select the correct answer from the codes given below:

List I

i.Gaylord Nelson

ii.Andrew Douglass

iii.Charles Elton

iv.Ernst Haeckel

List II

a.Earth day

b.Dendrochronology

c.Ecological niche

d.Ecology

Ai-b, ii-a, iii-d, iv-c

Bi-a, ii-b, iii-c, iv-d

Ci-c, ii-d, iii-a, iv-b

Di-d, ii-c, iii-b, iv-a

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