How is it better for the survival of the species for the protozoa to reproduce asexually instead of sexually?

Advantages of Asexual reproduction are as follows:

• This type of reproduction enable organisms to reproduce without a mate.
  
• It does not require the time and energy that takes to search a mate.
  
• It results in the reproduction of large number of offspring rapidly.
  
• Like in plants, it enables to spread and colonize an area in short period of time.
  
• Animals that are confined to one particular place and unable to look for a mate reproduce asexually.
  
• Stable environments with very little change are favorable for organisms to reproduce asexually.