If you want to observe the flower closer, you would use a magnifying glass.
Answer:
What causes genetic variation?
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).
Explanation:
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That body parts are called "Homologous Organs" which are similar in origin & structure.
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The correct answer is option Memorization.
The memorization of the data help the scientist to recall all the facts and the theories, which are related to the experiments. In case, a scientist remembers all the things, the analyzing the data would be easier, as he can relate the data without referring to many sources. Hence, memorization would be very helpful in making connections across the data.