Answer:
This is the process where certain things like pesticides work their way into water bodies and then move to the food chain to greater concentrations as they are incorporated into meals of aquatic organisms e.g. zooplankton. An example is: small fish that eats plankton that has been tainted with mercury.
Explanation:
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<span>The question says,'menstruation does not occur if the ............ The correct option is D. The uterine lining usually build up in order to serve as a bed and support for fertilized a egg. If fertilization does not occur, the uterine lining breaks down and come out as menstruation, but if fertilization occurs, then the uterine lining will not break down but will support the fertilized egg all through the pregnancy period.</span>
Answer:
B. The pathogen must be grown in pure culture.
Explanation:
Virus, and also some bacteria can not be cultured in "lifeless media". In the case of bacteria, we refer to the obligate intracellular ones, and all virus. Thus, this postulate can not be fulfilled in all cases. Virus can be propagated on tissue cultures, but certainly this was not considered by Koch. Moreover, these methods often result in spontaneous genetic alterations, which leads to adaptation and even attenuation in animal models of disease, so, the cultured virus perhaps does not induce the same disease when introduced to another specimen.
