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Microorganisms use elements, including oxygen from the ocean around them, to build their shell.
微生物利用周围海洋中的氧元素等物质来建造外壳。
The oxygen comes in a heavy form and a light form.
氧元素分重轻两种。
During warm periods the light oxygen evaporates and falls to the earth as rain, and then it runs back into the sea.
当气候较温暖时,轻氧蒸发,以雨水的形式落回地面,随后流回海洋中。
During cold periods, though it’s evaporating, it falls as snow and gets trapped on the land.
当气候较寒冷时,蒸发掉的轻氧以雪的形式落回地面,并留在那里。
This means there’s less light oxygen in the ocean, and therefore less in the microorganism’s shell.
这意味着气候寒冷时,海洋中的轻氧元素含量较低。同理,微生物壳中的轻氧元素含量也降低了。
By studying fossilised shells we can infer how the climate has changed in the past,
通过研究这些微生物外壳化石,我们可以推测出过去的气候变化,
and this is helping us to understand how our climate is changing today.
这也可以帮助我们理解当下的气候变化。

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Question:
When is there less light oxygen in the ocean ?
A  during warm periods
B  during cold periods
C  not mentioned
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