Annual Report on the Noxious Insects of the Province of Ontario
Author: Entomological Society of Ontario
Publisher:
Published: 1909
Total Pages: 580
ISBN-13:
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Author: Entomological Society of Ontario
Publisher:
Published: 1909
Total Pages: 580
ISBN-13:
DOWNLOAD EBOOKAuthor: Entomological Society of Ontario
Publisher:
Published: 1911
Total Pages: 540
ISBN-13:
DOWNLOAD EBOOKAuthor: Entomological Society of Ontario
Publisher:
Published: 1919
Total Pages: 744
ISBN-13:
DOWNLOAD EBOOKAuthor: Canada. Experimental Farms
Publisher:
Published: 1904
Total Pages: 1022
ISBN-13:
DOWNLOAD EBOOKAuthor: Entomological Society of Ontario
Publisher:
Published: 1913
Total Pages: 144
ISBN-13:
DOWNLOAD EBOOKAuthor: Entomological Society of Ontario
Publisher:
Published: 1904
Total Pages: 552
ISBN-13:
DOWNLOAD EBOOKAuthor: United States. Department of Agriculture
Publisher:
Published: 1917
Total Pages: 946
ISBN-13:
DOWNLOAD EBOOKAuthor: Wolf Engels
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 265
ISBN-13: 3642744907
DOWNLOAD EBOOKEvolution of Castes in Insects l BERNHARD RENSCH The evolution of organisms in the succession of generations has been primarilly achieved through the appearance of new hereditary variants with minor deviations along with the development of stable structures and functions. Harmful mutants were eradicated either immediately or in the subsequent generations through the process of natural selection while unharmful or advantageous ones usually survived. As this process continued, many new races and species developed which possessed structures and functions of a rational nature and which became increasingly independent from their environment. These evolutionary tendencies were also promoted through either geographical, ecological, physiological or genetical isolation of populations. In some phylogenetic lines, there occurred an increase in the number of cells due to additional cellular divisions in the morphogenesis of structures. This opened up the possibility for the development of the division of labour within cellular groups leading to more complicated and consequently more successful functions of tissues and organs. A further advancement in the adaptation of a species to its environment was made possible through specialization for certain functions of whole individuals or groups of individuals.
Author: Entomological Society of Ontario
Publisher:
Published: 1913
Total Pages: 680
ISBN-13:
DOWNLOAD EBOOKAuthor: Ontario. Dept. of Agriculture and Food
Publisher:
Published: 1907
Total Pages: 956
ISBN-13:
DOWNLOAD EBOOKConsists of individuals reports of each of the branches of the department.