Which of the following soil samples is the most porous? small rocks with pebbles and sand filling all the cracks. small rocks with pebbles filling some of the cracks. small rocks with open cracks. clay with small cracks.

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

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