Here's why:
* Yeast are unicellular organisms: They are single-celled, and their primary form of asexual reproduction is budding, where a small outgrowth forms on the parent cell and eventually detaches as a new yeast cell.
* Filamentous fungi are multicellular: They consist of long, branching hyphae that make up a mycelium (network). Their asexual reproduction involves the production of spores, which can germinate and develop into new hyphae.
However, both yeast and filamentous fungi can reproduce sexually. This involves the fusion of two haploid nuclei to form a diploid zygote.
In summary:
* Yeast: Budding (asexual) and sexual reproduction
* Filamentous fungi: Spore formation (asexual) and sexual reproduction
