Match each sentence with the statement that explains why it is included in the passage. A to develop the idea
that different
materials have been
used to make shoes
B to develop the idea
that scientist believe
humans have used
shoes for a long time
C to refine the idea
that materials used
for shoes have
evolved over time

1 In studying bones of the smaller toes of fossilized
skeletons, scientists observed that the thickness of
these bones decreased somewhere between 40,000
and 26,000 years ago.
arrowRight

2 Most soles are made from synthetic materials such
as ethylene, vinyl, acetate, rubber, and polyurethane,
which provide better traction, durability, and water
resistance than leather soles.
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3 The Masai of Africa used rawhide; the people of India
used wood; and the Chinese and Japanese used
rice straw.