Answer:
D
Explanation:
Stem cells transplanted into the facial tissue of two people with Parkinson’s disease led to sustained reductions in motor and non-motor symptoms, lower medication doses, and a better quality of life, a case study reported.
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The missing words are circle - shaped chromosome.
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Polymorphic. Polymorphisms
refer to spasmodic genetic variation within the same species of an organism resulting in varying forms of the species. Polymorphic viruses, mutate at faster rates hence the virus
population is subject to high rates of turnovers. The high divergence of various
species, such as influenza, is as a result of 0.01 mutations per nucleotide site
per year.
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