Final Answer:
Sporozoa are all parasitic protozoans.
Step-by-step explanation:
Firstly, the term "Sporozoa" is a taxonomic group that refers to a class of protozoans characterized by their unique mode of reproduction involving spore formation. Within this class, all members are parasitic, meaning they rely on a host organism to complete their life cycle. This parasitic lifestyle distinguishes Sporozoa from other protozoan groups that may have free-living or symbiotic relationships with their hosts.
Secondly, the parasitic nature of Sporozoa is evident in their life cycle, where they typically undergo complex reproductive stages involving both asexual and sexual phases. The formation of spores is a key feature in their reproductive strategy, allowing them to survive and spread in different environments. The parasitic lifestyle of Sporozoa often involves specific host organisms, and the members of this class are known to cause diseases in animals, including humans. Examples of Sporozoa include the genus Plasmodium, responsible for causing malaria.
In conclusion, the defining characteristic of Sporozoa is their parasitic nature. The members of this taxonomic group have evolved to be dependent on host organisms for various stages of their life cycle. Understanding this parasitic relationship is crucial for studying and combating diseases caused by Sporozoa, emphasizing the importance of research and measures aimed at preventing and treating infections associated with these parasitic protozoans.