Estimates of can change over time and across different groups; estimates for intelligence may differ with changes in nutrition, quality of school, neighborhood stability, and other factors.

Heritability

Explanation: Heritability could be defined as the degree of variation in phenotypic traits(obseservable physical attributes of an organism which may include appearance, behavior and development) in a population resulting from genetic variation of individuals in that population. It is used in examining how well the difference in genetic traits account for variation in the phenotypic attributes (observed physical characteristics) of individuals within a population.

The variation in estimates for intelligence might be further affected by nutritional differences, quality of school attended, neighborhood stability, peer influence and other environmental constraint.

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answer: a federal government has final authority on interstate/inter provincial  and international affairs, a confederation is one where the central/national government or authority is governing body what does not have final say over the same matters. hopefully this and i will try again if you don't like this answer : )

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