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It has a constant rate of change. It can be curved. It looks like a straight line. It must cross the origin.
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No, antibodies are not proteins that catalyze chemical reactions without being physically altered. Antibodies are proteins produced by the immune system to help recognize and neutralize foreign substances, such as bacteria and viruses. Enzymes are proteins that catalyze chemical reactions without being physically altered.
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No, it is not true.
It's not. If you speed is constant (but not zero), then your velocity won't be zero, either.You may be confusing this with the following: If your VELOCITY (not your speed) is constant, then your ACCELERATION is zero. Acceleration refers to how quickly velocity changes, so if velocity doesn't change at all, acceleration is zero.
If velocity is constant, the true acceleration is zero. Acceleration is the rate of change of velocity, so if velocity is not changing, the acceleration is also zero.