An isotonic solution refers to two solutions having the same osmotic pressure across a semipermeable membrane. This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side.
Earthquakes happen hope it helps
About 1.7 million species have been identified on earth.
Any formation in which groundwater rises on its own, under pressure, is called artesian well.
I'm not entirely sure about this one, so check out this website maybe they can help you out.
https://www.toppr.com/ask/en-ca/question/describe-interdependence-of-abiotic-and-biotic-components-by-taking-nitrogen-cycle-diagram/
Hope this helps!