On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.
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AOn Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow
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BOn Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth
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COn Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles
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DAmong the surest indications on Earth of sunspot cycles, believed to be the tree growth rate
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EAmong the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow
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