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Which of the following is not one of the main features of the vertebrate nervous system?

Select the correct answer(s).  

(0/0)

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Segmentation

Bilateral symmetry

Giant axons

Development from a hollow neural tube

none

Which of the following does not reflect convergent evolution for relative brain size?

Select the correct answer(s).  

(0/0)

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Six-layered cortex in all mammals

Large olfactory bulbs in some mammals and fishes

All of the above

Large cerebellum in mammals and birds

none

______ were the first hominids to create and use stone tools, an ability that reduced selection pressures for large jaws and teeth.

Select the correct answer(s).  

(0/0)

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Homo erectus

Homo sapiens

The australopithecines

Homo habilis