Question

Consider the following paragraph and indicate the best possible transition for Sentence 3.
1Single-use plastic water bottles cause dangerous substances to “leach” into the soil and water. 2The bottles typically do not begin to break down for one hundred years, or even longer. 3_______ their decomposition may be speeded up by extreme weather conditions, e.g., very hot or very cold temperatures. 4As they break down, they release dangerous chemicals like bisphenol-A into the soil. 5Bisphenol-A is an endocrine disruptor, i.e., it can affect the levels of hormones within the human body, creating disease. 6BPA is known to be carcinogenic (cancer-causing) in humans. 7As these chemicals accumulate in the soil, they eventually sink into the water table, contaminating the water. 8Making these threats even more frightening is the fact that there is currently no known technology for removing BPA and other leachates from the soil and water once they’re there.


Whenever


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Since

Answer 1

Whenever their decomposition may be speeded up by extreme weather conditions, e.g., very hot or very cold temperatures.