Mini quiz: Answer multiple choice questions.

Reading Comprehension 2.3

Scientists believe they may have uncovered another piece of the puzzle of how humans developed. Members of Dr. Ronald J. Clarke's scientific team discovered a prehistoric skeleton in the Sterkfontein Caves near Johannesburg, South Africa. It is the most complete skeleton of a hominid, or pre-Homo sapien, ever found. Believed to be between 3.2 and 3.6 million years old, the skeleton is also one of the oldest.

The discovery has many scientists excited because this is the first chance they will have to study the connection between how early hominids moved and how their bodies were built. Previous finds have not been complete enough to allow scientists to know for certain if early hominids both climbed and lived in trees like apes and also walked upright, or only walked upright. Studies of the foot and ankle bones of this newest discovery show that the creature did both, though it will take a lot more study before anything will be known for certain.

Scientists believe that the hominid, an adult about four feet tall, who was walking or running along the surface of the ground, fell into a 45-foot shaft leading to a cave and died there. Over the years, the body became covered by limestone. It will probably take at least a year to completely remove the whole skeleton from the rock around it. Before this latest discovery, the oldest, most complete skeleton of a hominid was the 3.2-million-year-old Lucy, found in 1974 in Ethiopia. Scientists expect this new skeleton to be much more intact than Lucy's, which was 40 percent complete.

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