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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Flucuated between hot and cold periods
Economics - is the social science that describes the factors that determine the production, distribution and consumption of goods and services
<span>B. Covalent bonds because the carbon likes to share its electrons with the hydrogen atoms</span>
Sexual reproduction<span> provides </span>genetic diversity<span> because the sperm and egg that are produced contain different combinations of </span>genes than<span> the parent organisms. ... Each resulting cell, or gamete, resulting from meiosis has only half the amount of DNA as the parent cell.</span>
