Placing the animal back among the birds "supports a single origin of powered flight," the study said.
The exclusively right-hand twist is one of the central pieces of evidence that indicates a single origin of all life on Earth.
The four carnivorous families in Caryophyllales (Dioncophyllaceae, Drosophyllaceae, Droseraceae, and Nepenthaceae) are closely related and suggest a single origin of carnivory within the order.
His logic: "A single origin of noise - say, a jet - can drag a cone of noise over a thousand square miles behind it".
Thirty years ago, a single origin of rice was the commonly held opinion [10, 49].
But whether or not this points to a single origin of the eye remains a subject for debate.
Bacterial genetic information is generally carried on a circular chromosome with a single origin of replication from which two replication forks proceed bidirectionally toward the opposite terminus region.
Our results support a single origin of monsoonal tropic taxa, followed by diversification within the region under the influence of the Australian monsoon.
How can the pre-domestication indica/japonica tendency in wild rice be compatible with a single origin of domesticated rice that is strongly suggested by a single major non-shattering allele in the two varietal groups?
Overall, our findings corroborate the hypothesis of two independent origins of eusociality in vespid wasps and suggest a single origin of using masticated and salivated plant material for building nests by Raphiglossinae, Zethinae, Polistinae, and Vespinae.
This research has shown that there was a single origin of ectomycorrhizal symbiosis in the Amanita genus.
