Final answer:
Stars like the sun primarily transport newly formed elements into the interstellar medium through convection.
Step-by-step explanation:
The primary method by which stars like the sun transport newly formed elements into the interstellar medium is through convection.
Convection occurs when currents of warm material rise, carrying their energy with them to cooler layers. In the case of stars, convection helps transport carbon and oxygen nuclei, produced through nuclear fusion, from the star's core to its surface. Near the end of a star's lifetime, it loses its outer layers into space, enriching the interstellar medium with the nuclei of heavier elements.