Answer:
Doppler effect is a change in frequency and wavelength of a wave. It is caused by the change in distance between the thing creating the wave (causer) and whatever is measuring seeing or hearing the wave (watcher or observer). Another word for "causer" is "sender".
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So other scientists can try the exact same experiment and see if they both got the same results.
Answer:
Sunlight and Water
Explanation:
Plants can make food from absorbing sunlight
Any cells of the human body, except the cells of a placenta.
The answer is 2 because its the outside number and not in the parentheses