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LS 6-2 Clues About Evolution
LS 6-2 Vocabulary Words
Terms in this set (14)
The persevered remains or traces of an organism that lived in the past.
Formed when layers of sand, silt, clay, or mud compacted and cemented together. Limestone, sandstone, and shale are examples- most fossils are found in this type of rock.
Based on the idea that in undisturbed areas, younger rock layers are deposited on top of older rock layers. Provides only an estimate of the fossils age.
Gives off a steady amount of radioactivity as it slowly changes to a non-radioactive element. Scientists can estimate the age of the rock by comparing the amount of this with the amount of non-radioactive element in the rock.
Estimating the age of the rock layer or fossil by using radioactive elements.
The study of embryos in their development. Similarities in the development of organisms (such as fish, birds, and mammals) suggest an evolutionary relationship among all vertebrates.
Body parts that are similar in origin and structure. They may also be similar in function, and can indicate that two or more species share common ancestors. Ex: comparing a porpoise flipper, a frog forelimb, a human arm, and a bat wing.
Body parts or features that don't seem to have a current function. Ex: manatees, snakes, and whales no longer have back legs, but all animals with legs they still have pelvic bones.
4.5 billion years
Age of the Earth
millions of years ago
billions of years ago
first life on Earth
types of fossils
imprint, mineralized, frozen, amber, cast
Green River Formation
Found in Wy, Ut, Co.- one of the richest fossil deposits in the world. It was a warm lake region (like Florida) 50 mya.
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