{% extends 'base.html' %} {% block title %}annotation{%endblock%} {% block title_num %}
-LRB- This requirement is why viruses are not considered living : they are not made of cells . To make new viruses , they have to invade and hijack the reproductive mechanism of a living cell ; only then can they obtain the materials they need to reproduce . -RRB- Some organisms consist of a single cell and others are multicellular . Cells are classified as prokaryotic or eukaryotic . Prokaryotes are single-celled or colonial organisms that do not have membrane-bound nuclei ; in contrast , the cells of eukaryotes do have membrane-bound organelles and a membrane-bound nucleus .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.