When energy is transformed, some is used, but most is released as unusable heat energy, according to the law of thermodynamics.

a.)universal
b.)third
c.)second
d.)first

b is the correct answer

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.