Help would be appreciated please :(

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

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Ascientific idea becomes valid when it is what?