Q: Which veins return oxygen-rich blood from the lungs to the heart?


Read this paragraph and choose the correct option from the provided answers:

Today in many countries, death rates have gone down but birth rates remain high. This means that the population is growing. Figure below shows the growth rates of human populations all over the world.

 Choices:

- jugular

- varicose

- respiratory

- pulmonary


A:
pulmonary