The membrane surrounding cells acts as a selective barrier, cradling and protecting the cell's contents from the external surroundings and choosing which substances to allow in or out of the cell.
Morning Overview on MSN
A polar vortex break can flip your weather fast. Here’s why
When the polar vortex stumbles, the weather at ground level can pivot from mild to brutal in a matter of days. A circulation that usually spins quietly above the pole can suddenly send lobes of Arctic ...
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