Submitted by admin on Fri, 04/18/2014 - 12:32
definition:
A single-celled microscopic animal of a group of phyla of the kingdom Protista, such as an ameba, flagellate, ciliate, or sporozoan.
sentence:
They have been considered animals, protozoans, fungi or space aliens.
difficulty:
medium
toefl frequency:
2
toefl classification: