The idea that organic forms changed through "effort," that the effort the organism makes in using those parts of its body that are most adaptive under given environmental circumstances and little by little as time goes on, that these changes result in new organs that are passed on through heredity, was developed by:

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Which statement about inheritance is true? o girls get most of their traits from their moms, boys get most of their traits from their dads. o male offspring will always have an x-linked genetic disease if the mom is a carrier o fathers always determine the gender of the offspring in humans. o males never have y chromosomes.

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.