Your body is a complicated machine, so you may be surprised to learn that important biological molecules that make up living things fall into only four main classes: carbohydrates, lipids, proteins, and nucleic acids.<span>Your cells are surrounded by a very important type of lipid, calledphospholipids. Phospholipids consist of a hydrophilic (or 'water loving') head and a hydrophobic (or 'water fearing') tail. Phospholipids like to line up and arrange themselves into two parallel layers, called a phospholipid bilayer. This layer makes up your cell membranes and is critical to a cell's ability to function.</span><span>
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<em>A. Chromosomes are strands of DNA, tightly wrapped up, that are located in the nucleus.</em>
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Average speed is distance divided by time. Velocity is speed in a given direction. Acceleration is change in velocity divided by time.
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