Related by context. Frequent words. (Click for all words.) 53 African savanna 49 savanna 49 grassy plains 49 savannahs 48 temperate forests 47 tropical forest 46 savannah 46 sequoias 46 scrublands 46 loblolly pines 45 saber toothed tigers 45 redwood forest 45 redwood forests 45 termite mounds 45 evergreen forests 45 deciduous forest 45 baobab tree 45 Homo sapiens 44 forest ecosystems 44 grasslands 44 biosphere 44 Namib Desert 44 savannas 44 forests 44 prehistoric creatures 44 primate evolution 44 Amazonian rainforest 44 primordial ooze 44 temperate rainforest 44 ecosystems 44 bipeds 43 moorlands 43 primeval forest 43 rainforest 43 dense thickets 43 ecology 43 African savannah 43 hunter gatherers 43 homo sapiens 43 arctic tundra 43 virgin forests 43 prehistory 42 tropical forests 42 National Instruments www.ni.com 42 evolutionary origins 42 giant sequoias 42 megafauna 42 rainforests 42 arid lands 42 drylands 42 conifer forests 42 endangered primates 42 tyrannosaurus rex 42 tropical jungles 42 banyan trees 42 Ice Ages 42 ecologies 42 endangered mountain gorillas 41 species extinctions 41 tropical rainforests 41 ecological niches 41 wetland ecosystems 41 lowland gorillas 41 Fertile Crescent 41 aspen groves 41 Ardipithecus ramidus 41 Homo Sapiens 41 forest 41 humankind 41 civilization 41 arid plains 41 indigenous cultures 41 medievalism 41 receding glaciers 41 longest solar eclipse 41 deciduous forests 40 giant tortoise 40 Anthropocene 40 hominid 40 biome 40 biodiverse 40 hominids 40 colossi 40 endangered mammal 40 deforesting 40 Kalahari desert 40 creatures 40 forest canopy 40 redwoods 40 freshwater ecosystems 40 poplar trees 40 inhospitable environments 40 vertebrate animals 40 terrestrial ecosystems 40 Inca Empire 40 boreal forests 40 dinosaurs 40 evolutionary 40 peopling 40 coastland 40 marine iguanas