When looking under a microscope comparing the muscle cell of an Olympic athlete and an average adult you notice there is a significant difference. What is the difference? Why does this difference exist?

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.

Environmental impacts on evolution : mastery test

What element is able to combine with itself and hydrogen to form large molecules ?