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Animal signals-involving combinations of acoustic, here chemical, visual, and behavioral cues-are among the most diverse traits in nature.Testing hypotheses about signal evolution has been hampered by difficulties with comparing highly divergent signals among species.In this Primer, I describe recent advances in capturing signals and studying their

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Small and fragmented arable land is a key challenge for small-scale agricultural countries, resulting in low labor productivity, ecological damage, and inefficient land use.To cope with this challenge, the farmland transfer (FLT) policy is implemented to establish modern agriculture based on specialization and scale enlargement.Despite the rising b