¿Cuántos minutos de actividad física nos recomiendan hacer y cuántos días a la semana?

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?

Which of the following areas has the highest population density?

The vegetation that thrives in the tundra is limited to a. mosses, barley, wheat, and corn. b. coniferous trees. c. dwarf shrubs, mosses, lichen, potatoes, and beans. d. mosses, lichen, algae, and dwarf shrubs.