以下为句子列表：
英文: Follow-up studies using the molecular clock produced estimates for this split that varied significantly, ranging from as old as one billion years ago to as young as just before the Cambrian period.
中文: 后来使用分子时钟来估算分支时间的研究结果，差异都很大，可能早至10亿年前，晚至寒武纪即将开始时。
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英文: In particular, they used a molecular clock rate derived from invertebrates, which is slower than the one based on vertebrates.
中文: 特别的是，他们使用从无脊椎动物推衍出的分子时钟，速度比脊椎动物的分子时钟要快得多。
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