HEY THERE! PLEASE HELP ME ANSWER THE FOLLOWING QUESTION- CORRECT ANSWER SHALL BE MARKED AS BRAINLIEST and be given 15 points♡♡ Question: "What does the doubled headed arrow for the tertiary consumers mean"?

*(I fr learned about this like a year or 2 ago but forget Imao)*

Thanks)) have a good day yall<3

What is one reason why areas that are just beginning to industrialize typically have a higher rate of population growth than countries that are already industrialized? a. most industrialized countries have laws regulating how many children women can have. b. the average lifespan in developing countries is much higher than in industrialized countries. c. developing countries need labor to fill their rapidly expanding industries. d. developing countries are just beginning to experience improved food production and health services.