If you took a sample of magnetotactic bacteria from the northern hemisphere to the southern hemisphere, would you expect them to survive

Yes.

Explanation:

Yes, magnetotactic bacteria can survive in the southern hemisphere if the suitable environment is available for them. These bacteria requires  freshwater and marine habitats and prefer environments that contain little to no oxygen means anaerobic conditions. This type of environment is also present in the southern hemisphere so we can conclude that this bacteria can survive in that environment.

genetic variation can be caused by mutation (which can 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).

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high