Kingdom Protista and the phyla under it.

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…a unique arrangement of microtubules and other organelles clustered at one end of the cell. Sporozoans have complex life cycles that involve both asexual and sexual reproduction. Sexual reproduction involves the fertilization of a large female gamete by a small, flagellated male gamete. The zygote that results soon becomes a thick-walled cyst called an oocyte, which is highly resistant to drought and other unfavorable environmental conditions. The best known sporozoan is the malaria-causing parasite Plasmodium.