Voltage difference is the push that causes charges to flow from high to low areas.
Carbohydrates<span> are the sugars, starches and fibers found in fruits, grains, vegetables and milk products
proteins are meats.
</span>Lipids<span> are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others.
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nucleic acids are <span>complex organic substance present in living cells, especially DNA or RNA, whose molecules consist of many nucleotides linked in a long chain.</span>
