Europe Asia shifting boundary convention

Europe and Asia have no fixed dividing line

Europe and Asia form one continuous landmass, but no sharp physical or political line separates them. The boundary uses natural features inconsistently and does not follow country borders. Cultural and language differences also vary along a spectrum rather than forming a clear dividing line.

A tumor can evolve from a small group of changed cells

Most cancers begin when a few cells gain mutations that help them grow or survive. Those cells multiply, and further useful mutations can spread through the growing cell population. Over time, this evolution inside the body can produce a tumor.

Bacteria can inherit a memory of a virus

After surviving a virus attack, bacteria and archaea can save pieces of the virus's DNA in CRISPR regions of their own DNA. Their descendants inherit these pieces and can use them to recognize and attack the same virus later.

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Europe Asia shifting boundary convention

Europe and Asia have no fixed dividing line

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