¿Es un elemento que es vital para que el ser humano dentro de su proceso de respiración?

Tall, cone-shaped mountains in which layers of lava alternate with layers of ash are called a. shield volcanoes. b. cinder cone volcanoes. c. composite volcanoes. d. lava plateaus. select the best answer from the choices provided a b c d i need asap

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b. diffusion c. endocytosis d. exocytosisc. endocytosis

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?