Directions: In each of the following sentences, a sentence is given with certain words in bold. Choose the pair/s of such words which need to be interchanged so as to make the sentence grammatically correct and meaningful.

While ecosystem losses have (a) accelerated over the past five decades universally, there is particular worry over the (b) integrity occurring in tropical areas, which are (c) endowed with greater biodiversity than others; only a quarter of the land worldwide now retains its ecological and evolutionary (d) devastation, largely spared of human impact.