Answer:
The sun
Explanation:
Our Sun is known to be of an average sized star.smaller stars and larger stars are known to exist and their sizes are up to 100 times larger in size. The sun found in the center of our solar system and it is very bright known to be a hot ball of hydrogen and helium. Stars are simply said to be big heavenly bodies that contains hydrogen and helium just like the sun and it gives light and heat due to the nuclear forges that is in its cores. Studies has shown that about 20% of stars are like the Sun while about 40-to-80 billion stars that looks like the Sun exist in our galaxy.
I think it’s A for the first one and C for the last
Answer:
A) social exchange theory.
Explanation:
In sociology and psychology, the social exchange theory refers to the process by which we take decisions analyzing the risks and benefits of our behavior and, after this analysis, we act according to it. In other words, we act to maximize benefits and minimize costs, so if something seems to "cost" a lot to us and doesn't give us too many benefits, we won't do it.
In this example, Katya donated money to a religious charity in order to boost her self-esteem while Jennifer is not donating money because she is fearful she might run out of money. We can see that they both analyze the costs and benefits of this action.<u> For Katya, the benefits are higher (boost of self-esteem) than the costs; while for Jennifer, the risks are too much (running out of money) </u>and therefore these differences are best explained in terms of the social exchange theory.
The streak of light in this remarkable photograph is a "shooting star<span>," a tiny speck of space </span>debris<span> burning up as it enters </span>Earth<span>'s </span>atmosphere.
<span>To the naked eye, a shooting star appears as a fleeting flash of white light. This image, however, documents the appearance of a wide </span>spectrum<span> of colors produced by the object as it hurdles toward Earth. These colors are predictable: first red, then white, and finally blue. If the </span>meteor<span> (shooting star) is</span>large enough to survive the fall through the atmosphere<span>, it cools and doesn't </span>emit<span> any visible light at all.</span>
<span>The colors of this shooting star may also </span>indicate<span> the </span>mineral<span>s that make up the space </span>rock. Differentelement<span>s emit different-colored light when they burn. </span>Iron<span>, one of the most common elements found in meteors, glows yellow. </span>Silicate<span>s, which contain a form of the element </span>silicon<span>, glow red. A green glow, clearly visible in the trail of this shooting star, indicates the presence of burning </span>copper.
<span>Understanding how, why, and when these colors appear is the science of </span>spectroscopy<span>. so yeah...</span>