Give two examples of how abiotic factors are influenced by biotic factors

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of