Which layers of sedimentary rock at grand staircase escalante national monument
do you think are the oldest?

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

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.