According to Scarr and McCartney,what Is the Main Reason That

question 1

Multiple Choice

According to Scarr and McCartney,what is the main reason that identical twins continue to have similar IQ scores throughout life whereas the resemblance between fraternal twins decreases with time?

• A) Genotype is the primary determinant of IQ.
• B) Environment is the primary determinant of IQ.
• C) Identical twins actively select more similar environments than do fraternal twins.
• D) Genotype determines an individual's environment in both childhood and adulthood.

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Definitions:

Marginal Tax Rate

The rate at which the next dollar of taxable income is taxed, reflecting the incremental increase in tax paid on an additional dollar of income.

Average Tax Rate

The ratio of the total amount of taxes paid to the total taxable income, representing the percentage of income paid in taxes.

Proportional Tax

A tax system where the rate of taxation is the same for all taxpayers, regardless of income or wealth.

Payroll Tax

Duties levied on both employers and employees, usually reflecting a portion of the payroll expenses.