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New research involving tiger salamanders indicates that the traditional theory of natural selection is more strongly supported by the evidence than is thought by those who consider only the case of the spadefoot toad tadpole.

What does thought by means in this sentence? Is it compared with supported by (supported by ... than thought by...)?

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Is thought is a passive; convert this to active voice, with the object of by as the subject:

Those who consider only the case of the spadefoot toad tadpole do not think that the traditional theory of natural selection is strongly supported.

But new research involving tiger salamanders suggest that the theory is supported more strongly than those scientists think.

Think in this context means believe.

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