When a beetle is born, the mother's and fathers genes assemble to create something new, those "genes" are "tested" to see if they will allow the beetle to live. If the beetle lives, they can reproduce, if they reproduce, those survival traits are passed down to their children.
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Bacteria are essential in cycling the nutrients back into the soil for plants to use, and cycling nitrogen back into the atmosphere. Nitrogen is found everywhere in the world, including animal waste, the atmosphere, and decaying matter.
Regulating muscle and nerve function, blood sugar levels, and blood pressure an making protein, bone, and DNA.