task for the posterior portion, which lacks most of the major
             organs--brain, eyes, and pharynx. The highest animals that exhibit vegetative reproduction are
             the colonial tunicates (e.g., sea squirts), which, much like plants, send out runners in the form
             of stolons, small parts of which form buds that develop into new individuals. Vertebrates have
             lost the ability to reproduce vegetatively; their only form of organismic reproduction is sexual.
             In the sexual reproduction of all organisms except bacteria, there is one common feature:
             haploid, uninucleate gametes are produced that join in fertilization to form a diploid, uninucleate
             zygote. At some later stage in the life history of the organism, the chromosome number is
             again reduced by meiosis to form the next generation of gametes. The gametes may be
             in size (isogamy), or one may be slightly larger than the other (anisogamy); the majority of
             ...