If an arctic polar bear is transferred to a zoo in tropical singapore, it will not be able to survive. what could be the reason for this?

If an Arctic polar bear is transferred to a zoo in tropical Singapore, it will not be able to survive. The reason for this is that the climate, POLAR bears are supposed to be in cold climate, not tropical it is not the proper habitat. Tolerance only for cold climates

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When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.