Final answer:
Algae and fungi have haploid-dominant life cycles and they spend most of their life as haploid organisms, with only a brief diploid stage during sexual reproduction.
Step-by-step explanation:
Algae and fungi spend the majority of their life cycle in the haploid condition. These organisms predominantly have a haploid-dominant life cycle, where the multicellular stage of the organism is haploid, with cells produced via mitosis. During sexual reproduction, haploid cells from two individuals combine to form a diploid zygote, which immediately undergoes meiosis to generate haploid spores.
These spores, containing a mix of genetic information from both parents, can lie dormant until conditions are right for them to develop into multicellular haploid organisms again through multiple rounds of mitosis.