What is activation energy? do all chemical reactions require the same amount of activation energy?

What are the 3 types of artificial cloning

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit

Which feature would you expect to find in a population in which sexual selection depends on male competition?