What is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber?

When explaining dominant and recessive traits to a younger family member, they respond, "well chances are i can probably taste ptc, since dominant traits are more common." how might you address this misconception?

What's the waste product of electrons and pyruvate combining in fermentation?  

Consider the venn diagram of plant reproduction. where in this image, areas a - d, would you insert the picture of the orange lily?