Answer:
evolution is random
Explanation:
there is no explination for evolution over time things find there own way to be better
Do not listen just getting points
<span>Polar covalent bonding is a type of chemical bond where a pair of electrons is unequally shared between two atoms. ... If the electronegativity of two atoms is basically the same, a nonpolar covalent bond will form, and if the electronegativity is slightly different, a polar covalent bond will form.</span>
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Answer: I would say 500 kcal
I’m not 100% sure though
Please comment if it’s right!