21.   In addition, chimpanzees can be taught a crude sort of sign language, suggesting that the brain of our common ancestors was beginning to be capable of language.

22.   It could be the last common ancestor of the hominid and chimpanzee lines, the earliest hominid, the earliest chimpanzee or an ape that eventually became extinct.

23.   It is still possible, Doolittle said, that that common ancestor could have been a cyanobacterium that had lived since the dawn of life.

24.   Martin guesses that the common ancestor was small, nocturnal and dwelled in tropical forest trees.

25.   Most of the ancient apes vanished, but from a common ancestor, modern apes evolved in one direction and the primitive predecessors of modern humans went another.

26.   No one has found fossils of this common ancestor, but Cooper and Penny are confident it lived in the Cretaceous.

27.   Officials believe the spiders have a common ancestor, probably a pregnant female tarantula that was being kept as a pet and either escaped or was released.

28.   Rightmire said he saw no reason yet to reconsider his idea that Homo heidelbergensis was the last common ancestor of Neanderthals and modern humans.

29.   Scientists said there could still be other transitional species closer to the common ancestor of apes and humans.

30.   She rejects the evidence most scientists say supports the theory that all living things share common ancestors.