What is the major cause of variation within a species?

Animals get energy from the food they eat. What is the original source of this energy?

Absolute zero is the temperature at which molecules have no

If one light in a string of lights is taken out and all the lights go out this circuit is a

Work is defined as

In which type of electric circuit are there many paths for electrons to flow?

Substances change phase when

The weight of an object is determined by

High winds are most likely found between

Which statement about cells is NOT true

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