Ecologists make models to gain insight into complex phenomena such as the effects of global warming on ecosystems.
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Velocity is a vector quantity which means it has both magnitude and direction means in order to calculate it another vector quantity is used which is displacement on the other hand speed is a scalar quantity.
The answer would be B, because they have subcellular organelles.
When an ice cube is compressed, it's pressure is increased. This causes the atoms to speed up, causing the solid to turn into a liquid.