Which characteristic is common in old rivers

a low stream gradient

Explanation:

emerald ash borer

the emerald ash borer is a green buprestid or jewel beetle native to north-eastern asia that feeds on ash species. females lay eggs in bark crevices on ash trees, and larvae feed underneath the bark of ash trees to emerge as adults in one to two years. hope this !

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.