With a few biology questions !

If a set of instructions that determines all of the charactersitics of an organism is comparedto a book,and a chromosme is compared to chaper in the book,then what might be compared to a paragraph in the book?

What is the next step in muscle contraction after the actin changes shape? (apex)

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