True or false? a theory is a scientific idea that has been proven to be true. !

Which is the correct first step in finding the area of the base of a cylinder with a volume of 26x cubic meters and a height of 6.5 meters? v=bh 6.5=b(26x) v=bh v=26pi+(6.5) v=bh v=26pi(6.5) v=bh 26pi=b(6.5)

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins

The method by which new genes can be acquired by successive generations: multiple choice. is called mitosis is called meiosis is sexual reproduction is fertilization is by mutations has been imagined as evolution theory has never been documented by the scientific method is known as genetic recombination i have mutations and mitosis already, anybody know any more to add.