18. Suppose you are an engineer designing a new cell phone. Describe the criteria (1) you would use, along with a possible constraint (1) and trade-off (1) in the design process.

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

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The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?