Step-by-step explanation
Somatic cells of a Volvox contain a single chloroplast and each one cell contains one nucleus. Euglena contains one nucleus, numerous chloroplasts. Oscillatoria lack a membrane-bound nucleus, mitochondria, Golgi apparatus, chloroplasts, and endoplasmic reticulum. Therefore, the correct answer is E. a and b only.
Answer
E. a and b only