I don't really have a math question but how are you guys today?

How could natural selection best be used to explain the evolution of the white fur of arctic fox

Which of the following processes within viral replication is the greatest source of genetic variation in rna virus populations? a) high mutation rate due to lack of proofreading of rna genome replication errors.b) transcription from the host cell rna polymerase introduces numerous mutations.c) capsid proteins from the host cell can replace the viral capsid.d) viral rna is translated by host cell ribosomes.

Which nutrients are a valuable resource in trying to build muscle?