Which of the following statements about protozoa is true?
A. All protozoa are photosynthetic.
B. Some protozoa reproduce by schizogony, a process that is virtually identical to the budding process that happens in some yeast.
C. All protozoa can undergo sexual reproduction.
D. When conditions become harsh, some protozoa can form a protective capsule, which is called a cyst.
E. None of the answer choices.
