No stars are expected with masses greater than 150 times our Sun ...

[lilldybug07]

No stars are expected with masses greater than 150 times our Sun because
 
  A) they would fragment into binary stars because of their rapid rotation.
  B) they would be too massive for hydrogen fusion to occur in their cores.
  C) molecular clouds do not have enough material to form such massive stars.
  D) they would generate so much power that they would blow themselves apart.
  E) they would shine exclusively at X-ray wavelengths and would be difficult to detect.

Question 2

A planet is most likely to have tectonic activity if it has
 
  A) high surface gravity.
  B) high internal temperature.
  C) a dense atmosphere.
  D) low surface gravity.
  E) low internal temperature.

[xMRAZ]

Answer to Question 1

D

Answer to Question 2

B

[lilldybug07]

TY

[xMRAZ]

You're welcome