Scientists have been able to make plants resistant to diseases by modifying their dna. the main tool for exploring this type of cell research is most likely immunostaining.
genetic engineering.
medication.
vaccination.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.