What is formed during the double fertilization process to help the sperm reach the egg in the ovary? 1.polar nuclei

2.stamen

3.stigma

4.pollen tube

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