Final answer:
The three types of sexual life cycles in multicellular organisms are haploid-dominant, diploid-dominant, and alternation of generations, with examples being Rhizopus, humans, and ferns respectively.
Step-by-step explanation:
The three most common types of sexual life cycles in multicellular organisms are: haploid-dominant, diploid-dominant, and alternation of generations. In the haploid-dominant cycle, the organism spends the majority of its life in the haploid state, such as in fungi and algae. An example of this would be the common bread mold, Rhizopus. The diploid-dominant cycle, typical of animals, is where organisms are predominantly in the diploid state, with the gametes being the only haploid cells; humans are an example of this life cycle. Lastly, the alternation of generations cycle features an alternating sequence between haploid (gametophyte) and diploid (sporophyte) stages, which is commonly found in plants, such as in ferns.