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For example, the locomotion of the collembola, Orchesella cincta, in relation to water. With increased water saturation in the soil there is an increase in the direction of its movement towards the aimed place. [1] Klinokinesis: in which the frequency or rate of turning is
[9] [10] [11] Rats have specialized supra-orbital whiskers that detect wind and cause anemotactic turning. [12] Chemotaxis is a response elicited by chemicals: that is, a response to a chemical concentration gradient. [8] [7] [13] For example, chemotaxis in response to a sugar gradient has been observed in motile bacteria such as E. coli. [14]
This course is designed for students who wish to pursue an interest in the life sciences. The College Board recommends successful completion of high school biology and high school chemistry [2] before commencing AP Biology, although the actual prerequisites vary from school to school and from state to state.
The example of king crabs (family Lithodidae) evolving from hermit crabs has been particularly well studied, and evidence in their biology supports this theory. For example, most hermit crabs are asymmetrical , and fit well into spiral snail shells ; the abdomens of king crabs, even though they do not use snail shells for shelter, are also ...
A Vermont or witch window. In American vernacular architecture, a witch window (also known as a Vermont window, among other names) is a window (usually a double-hung sash window, occasionally a single-sided casement window) placed in the gable-end wall of a house [1] and rotated approximately 1/8 of a turn (45 degrees) from the vertical, leaving it diagonal, with its long edge parallel to the ...
Turning toward the side or upside-down also occurs frequently in these clades (e.g. sea stars which turn their mouth downwards after the larva has briefly settled with the mouth turned up, or the adult lancelet which buries obliquely with its mouth turned up, or many fish which tend to turn around when feeding from the water surface).
An early advocate of the niche construction perspective in biology was the developmental biologist, Conrad Waddington. He drew his attention to the many ways in which animals modify their selective environments throughout their lives, by choosing and changing their environmental conditions, a phenomenon that he termed "the exploitive system".
The Grape-Vine is an alternation of second and fourth positions of the feet; one foot travelling sideways on a straight line, the other foot going from anterior to posterior fourth position, and vice versa. The step travels to the woman's right (the man's left), without turning.