Answer:
Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density). This change of direction is caused by a change in speed. When light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction
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<span> The amount of </span>energy<span> at each </span>trophic level<span> decreases as it moves through an ecosystem. </span>
Answer:
They lack a nucleus, but they do have ribosomes.
Explanation:
Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleoid.
Answer:
Epidemiology
Explanation:
Epidemiology is the branch of medicine that studies the presence, distribution, causes and best means of control of disease in the people of a given region at a particular time. It comes from the Greek epi- (on top of) and demos (people).