The loop of henle is a countercurrent exchanger because it creates a concentration gradient rather than simply maintaining it. false true

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?

Which activity occurs when a flowering plant reproduces?

Consider this microscopic image of bacteria, which bacterial form is shown in the image?