Aperson is born with an extra copy of chromosome 21, what type of mutation has occurred? a. dna mutation b. frameshift mutation c. somatic cell mutation d. non-disjunction mutation

The instructions for making proteins come originally from

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity

Acell in the human nervous system whose primary function is to form myelin and the blood-brain barrier, respond to injury, remove debris, and enhance learning and memory is called a(n) cell.