Related by context. Frequent words. (Click for all words.) 66 starch grains 59 microfossils 58 stromatolites 57 unicellular 57 mucilage 57 coprolites 56 unfertilized 55 mycelium 55 isotope ratios 55 snail shells 55 RNA sequences 55 diatoms 55 morphologically 55 oxygen isotopes 55 naturally occurring compounds 55 polymerized 54 naturally occurring mineral 54 terpenes 54 aragonite 54 sphagnum moss 54 leafhoppers 54 endosperm 54 Bt toxin 54 phenolic compounds 54 lectins 54 zeolites 54 synthetic polymers 54 arsenate 54 foraminifera 54 microenvironments 54 manganese oxide 53 oligosaccharides 53 melanosomes 53 salt crystals 53 greenish brown 53 isoprene 53 hemicellulose 53 single celled organisms 53 slime molds 53 nanosized 53 naturally occuring 53 organisms 53 pollen grains 53 inorganic compounds 52 isothiocyanates 52 marine sediments 52 calcareous 52 threadlike 52 Fossilized 52 fungi 52 Cyanobacteria 52 amyloid fibrils 52 chitin 52 spectral signatures 52 Poinar 52 lake sediments 52 lysozyme 52 multicellular organisms 52 organic acids 52 waxy substance 52 iron oxides 52 spherules 52 lectin 51 gamma tocopherol 51 placental mammals 51 mosses 51 tunicates 51 lignocellulose 51 microorganisms 51 fungal pathogen 51 histone proteins 51 naturally occurring substances 51 chloroplasts 51 mitochondrial genome 51 mouthparts 51 duckweed 51 Archaea 51 cattail 51 rice hulls 51 noble gases 51 Radiocarbon dating 51 ALH# 51 carbonized 51 nacre 51 polysaccharides 51 feathered dinosaurs 51 nitrogen fixing 51 cellulose 51 fossil specimens 51 alga 51 bacteria fungi 51 termite mounds 51 larval stages 51 nanoclusters 50 purine 50 chloroplast 50 boron nitride 50 pyrethrins 50 zircons 50 sauropods 50 nitrogen fixation