Would satellites orbiting closer to the Earth require more or less momentum to maintain their orbit? Explain your answer. PLEASE HELP

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

It is believed that europa, one of jupiter’s moons has an ocean beneath its surface. based on how earth’s oceans and atmosphere are believed to have formed, what can be said about europa’s supposed ocean? the arrival of in the early days of europa’s existence could have formed its ocean. it is likely that the water experienced , similar to earth. it is also possible that this water is retained beneath europa’s surface and in its atmosphere due to europa’s .

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs