According to uniformitarian theory, the major cause of change on the earth has been:

volcanic activity
catastrophic processes
erosion and deposition
earthquakes

Explain why phospholipid molecules form a bilayer. (3 marks)

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

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