Final answer:
Organisms reproduce asexually to rapidly produce offspring without needing a mate, resulting in a quickly growing population of genetically identical individuals, which can be beneficial in stable environments but a disadvantage in changing ones.
Step-by-step explanation:
Some organisms reproduce asexually because this method of reproduction can be very quick and does not require the meeting of male and female organisms. Asexual reproduction allows for the rapid growth of a population since every individual is capable of reproduction, leading to advantages in certain environmental conditions. Asexual reproduction often results in offspring that are exact genetic clones of the parent, which can be beneficial if the parent's traits are well suited to the environment.
However, it also means that all offspring carry the same genetic vulnerabilities, which can be a disadvantage in changing or unpredictable environments. Sexual reproduction introduces genetic variation which can be advantageous for populations in variable environments, as it enhances adaptability and increases the chance of survival against diseases and environmental changes.