From where in the body does the blood entering the superior vena cava come?

Plz ! ive been stuck on this forever

Diffusion and osmosis are forms of passive transport

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind