Enzymes are . Enzymes are . made of protein permanently changed by the substrate made of protein, are catalysts, and permanently changed by the substrate made of protein and are catalysts are catalysts

enzymes are biological catalysts.

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.

the answer is c. it will give up it's valence electron to the other atom.