The History Of Life And Evolution Crossword

scientist who studies fossils
information about past life, including the structure of organisms, what they ate, what ate them, in what environment they lived in, and the order in which they lived
term used when a species has died out
method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock
distinctive fossil used to compare the relative age of fossils
length of time required for half of the radioactive atoms in a sample to decay
technique in which scientist calculate the age of a sample based on the amount of remaining radioactive isotopes it contains
scale used by the phenomenologist to represent evolutionary time
one of several subdivisions of the time between the precambrian and the present
unit of time which era is divided
tiny bubble, formed of large organic molecules, that has some characteristics of a cell
theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms
microscopic fossil
events in which many types of living things become extinct at the same time
large-scale evolutionary changes that take place over long periods of time
process by which a single species or a small group of species evolves into several different forms that live in different ways; rapid growth in the diversity of a group of organisms
process by which unrelated organisms independently evolve similarities when adapting to similar environments
process by which at species evolve in responding to changes in each other
pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
change over time
combined genetic drift information of all the members of a particular population
number of times an allele occurs in a gene pool compared with the number of times other alleles occur
trait controlled by a single gene
trait controlled by two or more genes
random change in allele frequencies that occur in small populations