Question

Choose the correct answers from the alternatives given.
Which of the following normally occurs in most species

• A. Gene migration
• B. Mutation
• C. Genetic drift
• D. All of these

Answer 1

The correct option is D All of these

• Gene flow (also known as gene migration or allele flow) is the transfer of genetic variation from one population to another.
  
• Evolution is the process by which populations of organisms change over generations. Genetic variations can arise from gene mutations.
  
• Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance.
  

So correct answer is D, all of these.