What is the Big Bang ? Someone describe it for me it's for an essay please or break it down !

The Big Bang Theory is the leading explanation about how the universe began.  At its simplest, it says the universe as we know it started with a small singularity, then expanded over the next 13.8 billion years to the cosmos that we know today

Explanation:

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. fibrinogen is soluble in water and is found in high concentrations in the blood, where it waits until needed to form a clot

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.