s the Hertzsprung-Russell diagram still a valid instrument in studying stars, given that it is over 100 years old?

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 term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

18. which statement about cancer is true?