The breakdown of pollutants, water purification and soil formation are valuable
services provided by:
A. holistic sources
B. positive feedback loops
C. ecosystems
D. negative feedback loops
HELP ASAP

I believe the answer is C. ecosystems.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.