The History of Life

Science

Human-like Primates, Including New World Monkeys, Old World Monkeys, And Hominoids.

Anthropoid

Anthropoid Simple Definition

Walking On Two Legs, Like A Human, Ostrich, Or Kangaroo.

Bipedal

Bipedal Simple Definition

A Rapid Increase In The Diversity Of Lifeforms That Occurred During The Paleozoic Era.

Cambrian Explosion

Cambrian Explosion Simple Definition

States That Mitochondria And Chloroplasts Evolved From Eukaryotic Cells That Entered Prokaryotic Cells.

Endosymbiotic Theory

Endosymbiotic Theory Simple Definition

A Unit Of Geologic Time Longer Than An Age But Shorter Than A Period.

Epoch

Epoch Simple Definition

The Second-longest Unit Of Geologic Time, It Is Divided Into Periods.

Era

Era Simple Definition

A Timeline Of Earth's History Based On Major Changes.

Geologic Time Scale

Geologic Time Scale Simple Definition

The Time It Takes For Half The Atoms Of A Radioactive Isotope To Decay.

Half-life

Half-life Simple Definition

A Fossil From An Organism That Existed For A Short Time, It Is Used To Determine The Age Of Other Fossils.

Index Fossil

Index Fossil Simple Definition

When Many Species Become Extinct At The Same Time.

Mass Extinction

Mass Extinction Simple Definition

A Scientist Who Studies Fossils.

Paleontologist

Paleontologist Simple Definition

A Unit Of Geologic Time That Lasts Tens Of Millions Of Years, It Is Longer Than An Epoch But Shorter Than An Era.

Period

Period Simple Definition

The Theory That Earth's Crust Is Made Of Moving Plates.

Plate Tectonics

Plate Tectonics Simple Definition

Mammals With Features Like Opposable Thumbs, Forward Looking Eyes, And A Large Brain, Like Humans, Monkeys Or Apes.

Primate

Primate Simple Definition

Comparing The Amount Of Radioactive And Nonradioactive Isotopes To Determine Rock Age.

Radiometric Dating

Radiometric Dating Simple Definition

A Method Of Comparing Fossils Or Rocks To Determine Which Is Older.

Relative Dating

Relative Dating Simple Definition

The Theory That Life Can Arise From Nonliving Things.

Spontaneous Generation

Spontaneous Generation Simple Definition