Prevalence refers to
a) the number of individuals having a particular exceptionality.
b) the probability of having a child with a particular exceptionality.
c) the percentage of a population having a particular exceptionality.
d) the distribution of exceptionalities across different segments of the population.

C) the percentage of a population having a particular exceptionality.

Explanation:

Prevalence is a statistical term used to express the total number of persons having a condition as a percentage of a particular population, at a particular period of time. For example, if stated that: the prevalence of autism as an exceptionality is put at 6% of the population of children in a state, it means 6 out of every 100 children in that state have autism as exceptionality.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: