Final answer:
Sea anemones utilize sexual reproduction in unstable environmental conditions to produce genetically diverse offspring that can better cope with changing situations.
Step-by-step explanation:
Sea anemones would use sexual reproduction under conditions where the environment is less stable. Sexual reproduction combines reproductive cells from two individuals, creating genetically unique offspring that may have a greater chance at survival in changing conditions. This is because sexual reproduction introduces genetic diversity, which can lead to variations that may be better suited to cope with new or fluctuating environmental pressures, whereas asexual reproduction, although quicker and requiring only one individual, produces genetically identical offspring that might all be susceptible to the same threats.