To account for those normal differences in developmental rates, she estimated that the results would show that about half of children would score, if only temporarily, below average. (motherhoodinpointoffact.com)
We can also come to understand what constitutes normal variation, such as which developmental rates may be red flags for intervention, such as in the case of learning disorders, which may be attributed to a combination of individual differences. (verywellfamily.com)
For the study, the researchers incubated eggs from the Trachemys scripta elegans, a semi-aquatic turtle, under different temperature and moisture regimes to study the effect of the two environmental factors on developmental rate, egg mass, embryo mass and length, and sex ratio. (sciencedaily.com)