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외부지문 28 (14강1번)
11
화석을 통해 밝혀지는 생물체의 진화 과정
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Scientists today are able to accurately date fossils,
동격
the rock-bound remains of organisms
바위투성이 잔해물
from past geologic ages.
지질시대
STEP 1
STEP 1
When fossils are arranged along a timeline, scientists can see gradual changes from simple to more complex life forms.
In some cases, evolution through various intermediate forms (over millions of years)
중간
can be detected and compared to the present state of an organism.
SUBTOPIC 1
For example, the earliest known species of horse lived some 60 million years ago and, according to the fossil record, was shorter than 20 inches (50 centimeters) high at the shoulders.
Successive rock layers yield fossils of increasingly
생산하다
larger horse species, culminating in the horses of today. 드디어~이 되다
SUBTOPIC 2
(B) As size changed, so did other aspects of the horses’ anatomy: teeth became adapted to eating grass, the bones of the lower leg fused, and multiple toes evolved into a single
합쳐지다
toe surrounded by a hoof.
2
STEP 2
STEP
3
https://books.google.co.kr/books?id=6pGauDNi-QUC&pg=PA292&lpg=PA292&dq=For+example,+the+earliest+known+species+of+horse+lived+some+60+million+years+ago+and,+according+to+the+fossil+record,+was+shorter+than+20+inches+(50+centimeters)+high+at+the+shoulders.+Successive+rock+layers+yield+fossils+of+increasingly+larger+horse+species,+culminating+in+the+horses+of+today.&source=bl&ots=b6eHQLJ7lQ&sig=ACfU3U1CgthqMnNETdzyJRPecK9ffHOADw&hl=ko&sa=X&ved=2ahUKEwjz8engs8rqAhViF6YKHYtGCBAQ6AEwAHoECAoQAQ#v=onepage&q=For%20example%2C%20the%20earliest%20known%20species%20of%20horse%20lived%20some%2060%20million%20years%20ago%20and%2C%20according%20to%20the%20fossil%20record%2C%20was%20shorter%20than%2020%20inches%20(50%20centimeters)%20high%20at%20the%20shoulders.%20Successive%20rock%20layers%20yield%20fossils%20of%20increasingly%20larger%20horse%20species%2C%20culminating%20in%20the%20horses%20of%20today.&f=false