The higher groupings of life -- what some scientists call the eukaryote crown groups -- may have appeared in something of an evolutionary "big bang" about a billion years ago.
Part of the difference is due to inflation pushing people into higher groupings on the chart, but that doesn't explain the bars on the left.
Study author Tammy Campbell said: "If teachers place younger pupils early in their school career in lower ability groupings, and older pupils in higher groupings, this hasty (and potentially premature) sorting may have a significant impact on subsequent differences in educational attainment".
Our findings confirmed the tenuous nature of many grapevine species and especially higher groupings such as series.
In our opinion, the most recent proposal by Norton and Behan-Pelletier [ 34] with 24 superfamilies and no higher groupings best reflects the taxonomic situation/uncertainty within the "Higher Oribatida".
Quite some effort has been dedicated to revealing relationships in the taxon, and to supporting or rejecting the respective monophyly of traditional higher groupings such as Pulmonata and Opisthobranchia.
Post-hoc testing showed specific differences between the lowest and highest haemoglobin groupings (groups 1 and 4), between lowest and second lowest groups (1 and 2), and between the third and highest quartiles (groups 3 and 4).
Additionally, the moderate and high fit groupings differed significantly from the low fit group for weight and BMI.
The research articles are classified according to five conceptual high level groupings: electronic markets theory; system perspective with a focus on the technology or functionality with the system; adoption and implementation issues; organisational implications; and broader e-commerce issues.
Community based maternity units in developed countries are typically supported by criteria which aim to stream women into low or high risk groupings during the antenatal period [ 1, 10].
