Forces of evolution
Fossils preserved
Evidence for evolution
Origins of life
100

A random change in DNA

Mutation

100

the process by which organic matter exposed to minerals over a long period is turned into a stony substance

petrification

100

the remains of a prehistoric animal in a mold or cast

Fossil records

100

Underwater hot spring created perfect conditions for life to form

Hydrothermal vents

200

Changes in genes due to traits not being suitable for the environment

Natural selection

200

removing all moisture from the body leaving only a dried form that will not easily decay

mummification

200

leftover functions from earlier ancestor species

vestigial structures

200

The idea that life came from space 

Panspermia

300

Random event that kills off a gene

Genetic drift

300

Small animals or bugs getting trapped in tree resin

Amber

300

geographical distribution of plants and animals

Biogeography

300

A combination of the atmosphere and the ocean created life

Primordial soup

400

Exchange of genes between populations

Gene flow

400

animal sinks slowly into dense oil which keeps their bones perfectly preserved

tar

400

The more the animal is related the more similar the embryo looks 

Embryology

400

The idea that life can be created from nonorganic matter

Spontaneous generation