Con base en su masa, son la clase más abundante de moléculas biológicas en la Tierra Lipidos

Enzimas

Carbohidratos

Proteinas

segmentation=endoskeleton=backbone=coelom=tissues

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.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.