Apicomplexans are currently assigned to the SAR clade because __________.

• A. they have life cycles with both sexual and asexual stages
• B. they have true roots, stems, and leaves
• C. they are parasites
• D. Both the first and third responses are correct.
• E. the apicoplast, a modified plastid, appears to be of red algal origin

Answer: (E)

Verified step by step guidance

1. Understand the classification of Apicomplexans: Apicomplexans are a group of protists known for being parasitic. They are part of the larger SAR clade, which includes Stramenopiles, Alveolates, and Rhizarians.
2. Identify the characteristics of the SAR clade: The SAR clade is a diverse group of protists that share certain genetic and structural characteristics. One key feature is the presence of plastids, which are often derived from red algae.
3. Examine the role of the apicoplast: The apicoplast is a unique organelle found in Apicomplexans. It is a type of plastid that is believed to have originated from red algae through secondary endosymbiosis.
4. Connect the apicoplast to the SAR clade: The presence of the apicoplast, which is of red algal origin, is a significant reason why Apicomplexans are classified within the SAR clade. This organelle is a modified plastid that supports their classification.
5. Clarify the correct answer: While Apicomplexans do have life cycles with both sexual and asexual stages and are parasites, the defining feature for their classification in the SAR clade is the apicoplast's red algal origin.