"The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago, to the beginning of the Devonian Period, 419.2 Mya.<span> <span>Wikipedia."
https://www.google.com/search?q=He+Silurian+period+occurred&rlz=1C1RUCY_enUS760US760&oq=He+Silurian+...
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Population density is a measurement of population per unit area, or exceptionally unit volume; it is a quantity of type number density. It is frequently applied to living organisms, most of the time to humans. It is a key geographical term. Hope this answered your question
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B. In the twentieth century alone, the world population grew by more than 5 billion people.
C. Population grew slowly until the eighteenth century because death rates were higher.
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scale
Explanation:
A scale is usually found on a map and it shows the relationship between real life dimensions and map projections.
Maps are two dimensional representation of the the three dimensional world. When properly understood we can easily be properly guided and not have problems involving understanding the real life dimensions.
- A scale shows the representation factor used in moving from the real world to the map projection.
- There are different ways to represent scales on a map. Some use words, others use a bar scale and most maps are written with representative fractions.
learn more:
Physical maps brainly.com/question/3687554
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Answer:
The null hypothesis is a typical statistical theory which suggests that no statistical relationship and significance exists in a set of given single observed variable, between two sets of observed data and measured phenomena.
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