I cant understand this huh

Indica el nombre y la fucion de los vasos sanguineos que entran y salen de los riñones

What is hydroelectric power produced by?

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d. a round-trip ride to school and back