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scoundrel [369]
2 years ago
14

Can someone please help me and answer those, I’ll give you BRAINLIEST and your getting 50 points.

Geography
1 answer:
pashok25 [27]2 years ago
3 0

Answer:

Well, first off, stars are all different. The reason some stars look different could be because of their color, the tempurature difference, and in some cases if the stars are using gas or rocks to fuel themselves.

The color of a star is linked to its surface temperature. So the hotter the star, the shorter the wavelength of light it will emit. The hottest ones are blue or blue-white, which are shorter wavelengths of light. Cooler ones are red or red-brown, which are longer wavelengths.

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If the duration of life on Earth was on a scale of 20,000 days, for how many of those days would the human species be present?
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If the duration of life on Earth was on a scale of 20,000 days, the human species would be present in the Earth for approximately 9 days.

Explanation:

We can't be sure about the exactly age of the Earth, but we can base our calculus in a number between 4400 and 4600 million years, because the most accepted researches shows numbers in this span of time. We can take the average of those limits: 4500 million years.

On another hand the presence in the Earth of human species has not a precise date because of the it does not have a precise date for two main reasons, the scientific evidence does not include all the human species that existed on Earth but it is a very incomplete evidence and besides being an evolutionary phenomenon it is not easy to determine from what moment We can consider that a species belongs to the human race or not. In any case, we take the approximate date of the scientific evidence of the existence of human species in an age of 2 million years.

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