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3 years ago

Which idea did Ptolemy’s model use to explain why the planets appeared to move backward as they moved in their orbits?

Biology

1 answer:

Nataly [62]3 years ago

4 0

Answer:

Ptolemy included epicycles in his orbits.

Explanation:

Ptolomy's model of the solar system was geocentric, where the sun, moon, planets, and stars all orbit the earth in perfectly circular orbits. The problem with perfectly circular orbit around the Earth is that they do not explain the occasional backward motion, or retrograde motion, of the planets.

The Greeks insisted that the motion of the planets be perfectly circular. Ptolemy modeled the planets making small circles around a point that orbited the Earth. These smaller circles were called epicycles, and they allowed the planets to move backward relative to the background stars.

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MariettaO [177]

Answer:

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Explanation:

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3 years ago

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Anon25 [30]

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Explanation:

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3 years ago

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how could scientists test the hypothesis of different areas having lighter or dark skin pigmentation

Sergeu [11.5K]

scientists can test differences of the area with pigmentation by observing which is lighter and which is darker however they use microscope to look the difference of the pigmentation over the cells.

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3 years ago

How many three fourths are in five halves?

marishachu [46]

To know how many $\frac{3}{4}$ are in $\frac{5}{2}$ we can simply divide $\frac{5}{2}$ by $\frac{3}{4}$ .
$\frac{ \frac{5}{2} }{ \frac{3}{4} }$ = $\frac{5*4}{2*3}$ = $\frac{20}{6}$ = $\frac{10}{3}$
final result: 3,3333...

3 0

3 years ago

A human liver cell is very different in structure and function from a nerve cell in the same person. This is best explained by t

Yuri [45]

<h2>Liver cell Vs Nerve cell</h2>

Explanation:

b. liver cells can reproduce while the nerve cells cannot.

Liver cells , the fundamental units of liver are called hepatocytes. Hepatocytes secrete bile that helps in digestion by emulsifying fats. Hepatocytes are capable of dividing and they can regenerate damaged parts of the liver.

In contrast,

Nerve cells, the fundamental unit of nervous system are neurons. Neurons are longest cell of the human body and they contain a cell body and a long axon. Neurons conduct nerve impulses. Neurons are incapable of dividing and hence once damaged neuron cannot be replaced.

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3 years ago