This states that modern organisms evolved over long periods of time

This theory states that new species branch off from other pre-existing creatures

structures that are shared by related species and that have been inherited from a commoon ancestor are known as

This is a collection of genes in an area

This is the study of fossils to learn about ancient life

The principle of common decent states that

Thia explains why similair fossils are found on diffrent continents

body parts that share common function but not structure are known as

This is a body part that shares a common function ,but not structure

the time required for half the radioactive atoms on a sample to decay

The process by which inheritable traits become more or less common

This happens when humans pick and chose traits a species suvive

What are inherited from ancestors but have lost much or all of their original function due to diffrent selection pressures acting on the descendant

This is a body part that is used and has shrunk

What are used to gauge the relative age of fossils

Humans select favorable traits observed in an organism

This hypothesis states that species can change during their life by using and not using parts of their body

study of embryo's

This is the number of times an allele occures in the gene pool

What is the name of the time line of earths history

The ability to stay alive

This theory eplains that ancestors shared structures with their recent decendents and that they've changed over time

What common ancestor does alligator and chicken have

Allele frequency in the gene pool does not change

What is the name of the era we currently live in