Changes Over Time and Evolution

Science

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A Fossil Formed When Dissolved Minerals Fill A Mold And Harden.

Cast

Cast Simple Definition

The Change In A Species Over Time.

Evolution

Evolution Simple Definition

The Death Of All Members Of A Species.

Extinction

Extinction Simple Definition

The Preserved Traces And Remains Of An Organism That Lived Long Ago.

Fossil

Fossil Simple Definition

The History Of Life Recorded By All The Fossils We Have Collected.

Fossil Record

Fossil Record Simple Definition

The Evolution Of A Species, As A Gradual Change Over Time.

Gradualism

Gradualism Simple Definition

A Similar Structure In Different Species, Like A Whale Fin, Bat Wing And Your Arm.

Homologous Structure

Homologous Structure Simple Definition

When Many Species Become Extinct At The Same Time.

Mass Extinction

Mass Extinction Simple Definition

A Rock Fossil Created When A Buried Organism Dissolves.

Mold

Mold Simple Definition

The Individuals Best Suited To Survive In An Environment.

Natural Selection

Natural Selection Simple Definition

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

Primate

Primate Simple Definition

An Unstable Element That Emits Particles And Energy As It Changes Into Another Element.

Radioactive Element

Radioactive Element Simple Definition

The Evolution Of New Species From An Existing Species.

Speciation

Speciation Simple Definition

Any Difference Between Members Of The Same Species.

Variation

Variation Simple Definition