Which of the following is NOT one of the four systems into which scientists divide earth A. biosphere
B. hemisphere
C. geosphere
D. hydrosphere

Environmental impacts on evolution : mastery test

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?

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