Answer: "a stationary front" .
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Answer:

Explanation:
The swimmer can be modelled by the Principle of Energy Conservation. The speed is derived herein:




Answer:
Your microwave will not turn on, and you speculate that a circuit breaker in the house has been tripped. In scientific terminology, the steps would be described as: <em><u>developing a hypothesis based on an observation</u></em>.
Answer:
A. models
they look at it make a model study the model.