Topic 5C Flashcards
1
Q
RNA world hypothesis
A
postulate that RNA was the original information-storage molecule in the earliest forms of life on Earth
2
Q
trace fossils
A
fossils of animal tracks and trails in sediments that preserves a record of both anatomy and behaviour
3
Q
geologic timescale
A
the series of time divisions that mark Earth’s long history; can be recorded by fossils
4
Q
radiometric dating
A
a method that uses the radioactive decay of carbon-14 to date wood and bone
5
Q
mass extinctions
A
rapid and substantial drops in diversity often through large extinctions
