Answer:
A. aneuploidy; trisomic
Explanation:
Aneuploidy means having more numbers of chromosomes than usual while polyploidy means having an abnormal number of chromosome sets. Down syndrome is a trisomy on chromosome 21 meaning there are 3 chromosomes for chromosome set 21.
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This answer to this question is c
Octopus<span> muscle fibers run in all directions; when contracted, they form a "skeletal" support system.</span>
