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References in classic literature ?
It would be easy to show that within the same group carnivorous animals exist having every intermediate grade between truly aquatic and strictly terrestrial habits; and as each exists by a struggle for life, it is clear that each is well adapted in its habits to its place in nature.
Although no graduated links of structure, fitted for gliding through the air, now connect the Galeopithecus with the other Lemuridae, yet I can see no difficulty in supposing that such links formerly existed, and that each had been formed by the same steps as in the case of the less perfectly gliding squirrels; and that each grade of structure had been useful to its possessor.
Yet reason tells me, that if numerous gradations from a perfect and complex eye to one very imperfect and simple, each grade being useful to its possessor, can be shown to exist; if further, the eye does vary ever so slightly, and the variations be inherited, which is certainly the case; and if any variation or modification in the organ be ever useful to an animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could be formed by natural selection, though insuperable by our imagination, can hardly be considered real.
In reading scores, two of the four within-cohort comparisons reveal a widening of the black-white gap as children move through school: between the 1st and 2nd grades, the gap grew one-third of a standard deviation larger, and another one-fifth of a standard deviation larger between grades 3 and 5.
Grades Kindergarten 1 to 4; Elementary to Junior High (Grades 1-9)
Although middle school students commute to school on a bus with students from similar geographic areas, students also ride with all students in grades 6 to 12 in the school district.
Frequently, the histologic grade of the tumor is not determined until the final resection specimen is examined.
Americans want quality education, but when lower grades and higher failure rates reach their own children's classes, they rebel and schools relent.
Tomlinson appointed the monitors each month in a competition arranged by grade, each grade receiving one monitor, the criteria for selection being achievement in "scholarship and deportment.
Reading through the text from the early grades, the AIDS teacher's manual reflects the view that AIDS is not just a disease, but a cause to be supported by compassionate Catholics.
However, these conventional grades have clear limitations in their ability to provide cost savings through compound extension - and molded parts manufacturers have long since taken their formulations to those limits.