1. The British naturalist, Charles Darwin, was accused of .......... by Victorian clergy for his opinion that man could have been descended from an ape-like creature.

2. His theory quickly gained .......... and was published in newspapers around the world.

3. Darwin felt obligated to change some of his original statements, altering the relevant passage to leave readers to draw their own .......... .

4. Other British naturalists stated that the gradual .......... from "knuckle walking" to an upright position was incorrect.

5. Supposedly, there would have been many advantages to man's survival as a biped. Walking on two legs would expend much less energy than .......... in trees.

6. Other British naturalists suggested that walking on two feet left both hands free for .......... food or the gathering of wood.

7. The .......... of man being related to apes, has been changed by the modern use of DNA analysis.

8. In 1979, a discovery of ancient human footprints caused a major scientific breakthrough. The .......... prints dated back 3.6 million years and proved that people were able to walk on two legs.

9. Even the most minute pieces of fossil discoveries can tell a .......... a great deal about how our ancestors lived.

10. A fragmented skull recently discovered in Chad is thought to be our 7 million year old ancestor. It has an ape's flat face and small brain, but research determined the .......... was definitely human.