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The idea that all living things are made up of cells is considered scientific law. this means the idea is an emerging scientific idea that has a logical explanation. has been tested with similar results at least twice. is supported by scientific consensus and a large amount of evidence. has been rejected only once by the scientific community

Why do we perceive objects as retaining their brightness under different lighting levels?

Explain what is meant by a river’s load, and describe how the load is carried.