Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection. Sunspots usually appear in pairs of opposite magnetic polarity.
As the semimajor axis of a planet increase, the orbital period will decrease and the speed of the planet will decrease.
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What is Kepler's second law?</h3>
Kepler's second law of planetary motion describes the speed of a planet traveling in an elliptical orbit around the Sun.
This law exaplains the speed of planets around the sun, the speed of the planet increases as it nears the sun and decreases as it recedes from the sun.
From the findings, the astronomical unit of the Mercury is 0.387 and the orbital period is 0.24 year.


From the equation above, as the semimajor axis of a planet increase, the orbital period will decrease and the speed of the planet will decrease.
Learn more about orbital period here: brainly.com/question/22247460
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Answer:
Idea models represent the premise of the idea, but the model is just that, it's a simpler form of the idea.
In reality idea can vary on how complex or simple they can be and models are usually made to represent ideas that are too complex to just make or say.
The answer is B. The reason is because in an RNA strand, A turns into U.