Which of the biogeochemical cycles can impact all of the others the most directly?
select one:
o a. phosphorous cycle
o b. carbon cycle
c. nitrogen cycle
o d. water cycle

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.