Well there are many but the surface of the earth is the material violin one outer core (if that makes sense
Soil creation is a result of carrying out successions. Succession is the process in which land that is inhabitable by organisms is reclaimed and made fertile. This is done using pioneer species, which do not require soil to grow. After a while, these species are removed and a secondary succession is carried out. After this process, soil is created and the land becomes fertile.
The genetic info is found in the nucleus.
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Hello!</h2>
The answer is:
b. 
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Why?</h2>
The centripetal acceleration or radial acceleration is present when an object is moving to describe a circular path. The centripetal acceleration is always perpendicular to the direction of the velocity and going inwards and towards the center.
The centripetal acceleration can be calculated using the following equation:

From the statement we know that:

So, calculating we have:

So, the correct answer is:
b. 
Have a nice day!