Related by context. Frequent words. (Click for all words.) 58 single celled 57 reproduce asexually 55 multicellular 55 multicellular organisms 54 celled 54 single celled organisms 54 photosynthetic bacteria 53 unicellular 53 photosynthetic organisms 52 genetically altering 52 neural progenitor cells 52 protists 52 nematode worms 52 Firmicutes 52 Chlamydomonas 52 prokaryotes 52 bacterium Escherichia coli 52 unfertilized 51 Scientists theorize 51 Streptomyces 51 prokaryotic 51 flatworms 51 filamentous 51 diatom 51 spermatogonial stem cells 51 fruitflies 51 sessile 50 morphologically 50 inhibited tumor 50 phytochrome 50 coevolution 50 organism 50 wormlike 50 regrows 50 nutrient uptake 50 vertebrate animals 50 Penicillium 50 respire 50 Caenorhabditis elegans 49 cone snails 49 evolutionary origins 49 Cyanobacteria 49 fossilize 49 triploid 49 flatworm 49 lysozyme 49 Geobacter 49 slime molds 48 Xenopus 48 methanogens 48 organismal 48 Amino acids 48 overexpressing 48 primitive organisms 48 mycorrhizal fungi 48 neural crest cells 48 metabolically active 48 symbiotic bacteria 48 selectively bred 48 somatic cells 48 single celled organism 48 biological molecules 48 placental tissue 48 bioassays 48 macromolecule 48 tetrapod 48 diatoms 48 motile 47 echinoderms 47 nanosized 47 rotifers 47 vacuoles 47 plasmodium 47 cell culturing 47 proinsulin 47 Archaea 47 microbial ecology 47 secondary metabolites 47 archaea 47 Uric acid 47 marine invertebrates 47 genetically identical 47 eukaryotes 47 organisms 47 haploid 47 teratomas 47 genetically encoded 47 Ediacaran 47 eukaryotic 47 microinjection 47 amphibians reptiles 47 endoderm 47 photosynthetic 47 mammalian 47 undifferentiated cells 47 killifish 47 oxidise 47 planktonic 47 photosynthesizing 47 eukaryotic cells 47 transgenic mouse