True or false? the circulatory system of humans is composed of two loops: the systemic circulation, in which blood flows between the heart and lungs, and the pulmonary circulation, in which blood flows between the heart and the rest of the body.

What is a functional group? a group of organic molecules that work together to speed up reactions a group of organs in the body that work together to perform a certain function a group of atoms bonded to carbon that determines how the molecule will react a group of living things that are made up of organic compounds