Virchow wondered whether the bacteria that he often saw in infections were the cause or a side-effect, but eventually came to accept Pasteur's demonstration of their infectious nature. If you have not had "Med Micro", don't worry. We are concerned with what these organisms do to people, rather than details of their biology. Everyone in the class will probably want to skim the section of a good pathology book to review basic microbiology and tissue reactions.
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sperm whale | Size, Teeth, Diet, Habitat, & Facts | qconceptstore.com
Locomotor adaptations The most noticeable adaptation of cetaceans to life in the water is their locomotive system. Because cetaceans descended from mammals that moved their limbs in a vertical plane rather than in a horizontal plane, they use vertical strokes when they swim, instead of horizontal strokes like a crocodile or fish. Cetaceans evolved from four-legged quadruped terrestrial animals, for which limbs played a primary role in movements, into virtually limbless aquatic creatures living in an environment where the back muscles are more important. Forelimbs are still present but are reduced to finlike flippers having shortened arm bones and no individual fingers. The hind limbs are lost entirely; only vestigial elements sometimes remain internally. Pelvic remnants occur in all cetacea but the dwarf and pygmy sperm whales. Flippers help to steer, while the back muscles, which are very large, drive the tail to propel the animal.
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Dwarf sperm whale
Bring fact-checked results to the top of your browser search. Sex patterns Since the great value of sex as distinct from reproduction is the reassortment and recombination of genes every generation, sex cells from two separate parents ordinarily give rise to the greatest variaton, unless the parental individuals are themselves too closely related to each other. The presence of male and female individuals, respectively, generally produced in approximately equal numbers, is characteristic of so much of the animal kingdom that it appears to be the natural state. All that is certain, however, is that this condition has evolved as the most effective means to the particular end, and it may have done so independently among the various more or less unrelated groups of animals. The condition of separate sexes is not a universal fact, and two sexes within the same individual is typical of the more sluggish or actually attached kinds of animal life.
Development[ edit ] During the development of the embryo , coelom formation begins in the gastrulation stage. The developing digestive tube of an embryo forms as a blind pouch called the archenteron. In Protostomes , the coelom forms by a process known as schizocoely. The archenteron initially forms, and the mesoderm splits into two layers: