What law states that the force that stretches the vascular wall is proportional to the diameter of the vessel times the blood pressure

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?

Organisms that successfully adapt will leave to grownone of the above

What is the ecological role of food chains and food webs