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Chronobiology – field of biology that examines periodic (cyclic) phenomena in living organisms and their adaptation to solar- and lunar-related rhythms. Dendrochronology – study of tree rings, using them to date the exact year they were formed in order to analyze atmospheric conditions during different periods in natural history.
11,000 years ago, during the Late Wisconsin stage of the Pleistocene glaciation, most species of earthworms perished. [14] Komarekiona eatoni is believed to be the only species of its family to have survived. [26] In phylogenetic analyses, Komarekiona forms a clade with Sparganophilus. [27] [28] The two families diverged an estimated 69.57-110 ...
Year 7 is an educational year group in schools in many countries including England, Wales, Australia and New Zealand. It is the seventh full year (or eighth in Australia and England) of compulsory education and is roughly equivalent to grade 6 in the United States and Canada (or to grade 7 for the Australian Year 7). Children in this year are ...
These three versions, and their corresponding newly developed laboratory exercises, were piloted at high schools around the United States during the 1960–61 school year. The curriculum materials were then revised during the summer of 1961 based on feedback from teachers, students, and professional biologists, and tested again during 1961–62.
Light micrograph of a moss's leaf cells at 400X magnification. The following outline is provided as an overview of and topical guide to cell biology: . Cell biology – A branch of biology that includes study of cells regarding their physiological properties, structure, and function; the organelles they contain; interactions with their environment; and their life cycle, division, and death.
The earliest evidence of eukaryotes dates from 1.85 billion years ago, [109] [110] and while they may have been present earlier, their diversification accelerated when they started using oxygen in their metabolism. Later, around 1.7 billion years ago, multicellular organisms began to appear, with differentiated cells performing specialised ...
Seventh grade (also 7th Grade or Grade 7) is the seventh year of formal or compulsory education. The seventh grade is typically the first or second year of middle school. In the United States, kids in seventh grade are usually around 12–13 years old. Different terms and numbers are used in other parts of the world.
Cell Biology in "The Biology Project" of University of Arizona. Centre of the Cell online; The Image & Video Library of The American Society for Cell Biology Archived 2011-06-10 at the Wayback Machine, a collection of peer-reviewed still images, video clips and digital books that illustrate the structure, function and biology of the cell.
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