Chapter 8 Puzzle 2

1. is the amount of time it takes for half a radioactive element to turn into another element
2. suggested in the early 1900’s that mutations could result in evolution
11. this theory predicts that a layer of heavy moisture once surrounded the earth
12. evidence of a once-living organism embedded or preserved in rock
13. the loss of the protective canopy may have led to the multiplication of these
14. this dating method measures the decay of radioactive substances into nonradioactive substances
16. hypothesizes that there have been periods of time when evolution occurred very rapidly and other times when three was little change at all
17. this was the main concept of Darwin’s theory of evolution and is often referred to as the survival of the fittest
18. one evidence of evolution compares growth phases of these to show similarities between different animals

1. bones like those found in the human arm and bird’s wings and are thought by evolutionists to show common ancestry
3. according to the canopy theory, these may have begun moving during the Genesis flood
4. organisms that are thought to have lived in a specific evolutionary time period and are used for dating other fossils
5. these are also called missing links and are thought to show evolutionary changes between two different groups of animals
6. these fossils have both reptile and bird characteristics
7. the earth’s canopy would have provided great protection from this
8. the frame of reference that a person uses to interpret and understand the world around them
9. fossil thought to be a missing link between fish and amphibians until it was found living in the ocean
10. young earth creationists believe the earth’s date of creation between six thousand and ____________ years old
15. a well known type of radiometric dating that takes about 4.5 billion years for half of the sample to decay