Question

The diffusion of water across a selectively permeable membrane is called

Answer 1

Google: Osmosis

You'll get a lot of information. I also suggest Cohesion and Adhesion. It'll help you grasp an understanding of the concept. All these involve permeable paths for water.

Answer 2

Also, you should ask these questions in Biology

>>> openstudy.com/study/groups/biology

I hope you enjoy your stay! :)
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Answer 3

OSMOSIS.