Genetic variation can<span> be </span>caused<span> by </span>mutation<span> (which </span>can<span> create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).</span>
The correct answer is "limited prey is driving the bears to seek food in human settlements".
Due to the warming of the Arctic waters, the ice is melting, resulting in a serious decline of floating winter ice. Polar bears need these floating parts of ice to hunt, therefore this new situation limits the hunting opportunities of the bears. That is why polar bears are driven to human settlements to look for food.
The use of a drug to prevent a person at risk of an imminent infection is called <u>prophylaxis.</u>
What is Prophylaxis?
- Prophylaxis is the steps intended to maintain health (individually or collectively) and stop the spread of disease.
- For instance, Sydenham's chorea can be avoided by using preventive antibiotics following a case of rheumatic fever or for prevention against polio meant avoiding crowds and public swimming pools prior to the development of the polio vaccine.
What medications are prescribed for prophylaxis?
- Intravenous "first generation" cephalosporin antibiotics, such as cephazolin or cephalothin, are frequently used as surgical prophylactic antibiotics.
- injections of gentamicin
- Rectal or intravenous metronidazole (if anaerobic infection is likely)
- Tinidazole oral (if anaerobic infection is likely)
Learn more about the Prophylaxis with the help of the given link:
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A chemical change is a change in which the composition of the matter is changed at the molecular level, most chemical changes are not easily irreversible, for example, an egg being cooked, the egg changes from its liquid like state to a solid, and it is not possible to revert it back to its original change. The egg itself is changed in this case.
A physical change on the other hand however, is only changing the substance of a matter, not its composition, this is usually easily reversible. For example, water turning into ice, the water's substance changed from its liquid state to its solid state, it is still water, and it can easily be turned back into water by heating it.
Sorry for the long explanation,
Hope this helps!
