Abell-shaped curve that characterizes a large sample of intelligence test scores is a graphic representation of aa. factor analysis. b.normal distribution. c.heritability estimate. d.savant syndrome. e.gfactor

The answer is Normal Distribution

Explanation:

The bell-shaped curve describes a test analysis which is symmerrical in shape because of its area of concentration. A typical example can be seen in a test scores of students in a pratical examination where the bulk of the average lies in the bulged point and a few with excellent performance to the right, while other few with poor performance to the left.This explains why it assumes the shape of a bell when plotted ona graph.

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the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.