Related by context. Frequent words. (Click for all words.) 61 reproduce asexually 59 humans 59 evolutionary origins 58 amphipods 58 sexual dimorphism 57 evolutionary adaptation 57 Evolutionary biologists 57 platypuses 56 predator prey relationships 56 organismal 56 vertebrate animals 56 coevolution 56 stickleback 55 mammals 55 opposable thumb 55 photosynthetic organisms 55 flatworms 55 asexual reproduction 55 placental mammals 55 contagious yawning 55 methanogens 55 convergent evolution 55 Fruit flies 55 herbivory 54 echidnas 54 mole rats 54 evolutionary 54 macroevolution 54 nonhuman animals 53 tetrapod 53 plesiosaurs 53 multicellular organisms 53 microevolution 53 wormlike 53 physiology 53 Toxoplasma 53 crocodilians 53 creatures 53 flatworm 53 arthropod 53 thermoregulation 53 nematode worms 53 T.rex 53 genetic manipulations 52 vocalisations 52 protozoan 52 symbionts 52 neural crest cells 52 gut microbiota 52 saber toothed tigers 52 species 52 painful stimuli 52 Scientists theorize 52 single celled organisms 52 marine invertebrates 52 arthropods 52 unicellular 52 physiological 52 predator prey 52 nonhuman primate 52 marine iguanas 52 primate evolution 52 organisms 52 reproductive biology 52 vertebrate 52 mammalian 52 gene splicing 51 Daphnia 51 predation 51 yellow legged frogs 51 rotifers 51 genetic alteration 51 self replicating 51 refugia 51 genetics 51 chytrid 51 larval stages 51 mammal 51 Indohyus 51 Evolutionary theory 51 insects 51 sticklebacks 51 voracious predators 51 toothed whales 51 slime molds 51 carnivorous plants 51 sociality 51 kangaroo rat 51 lifeform 51 fruitfly 51 spotted hyenas 51 Scientifically speaking 51 reproductive physiology 51 mouthparts 51 ecological niches 51 morphologically 50 nonhuman primates 50 habituation 50 Chlamydomonas 50 fossilization 50 theropod dinosaurs