The History of LifeThe History of Life

Nathaniel NovakPeriod 4

Nathaniel NovakPeriod 4

FossilsFossils

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Fossils show that there was definitely life an earth a long time ago and gives us information on how life has changed.

Fossils show that there was definitely life an earth a long time ago and gives us information on how life has changed.

Early EarthEarly Earth

Earths early atmosphere was highly toxic. Eventually oxygen levels rose and made life possible for new organisms.

Earths early atmosphere was highly toxic. Eventually oxygen levels rose and made life possible for new organisms.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Sexual ReproductionSexual Reproduction

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Eventually cells began to reproduce sexually which allowed evolution too happen much faster.

Eventually cells began to reproduce sexually which allowed evolution too happen much faster.

The Rise of Multicellular Life

The Rise of Multicellular Life

In the Paleozoic era marine life evolved and during the Devonian period animals first crawl onto land.

In the Paleozoic era marine life evolved and during the Devonian period animals first crawl onto land.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Mesozoic EraMesozoic Era

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Dinosaurs and flowering plants become abundant.

Dinosaurs and flowering plants become abundant.

Cenozoic EraCenozoic Era

This was the age of mammals that could live on land sea or in the air.

This was the age of mammals that could live on land sea or in the air.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Significant ExtinctionsSignificant Extinctions

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Mass extinctions have wiped out entire species and leave habitats open for new ones. One theory for how dinosaurs became extinct is a huge meteor hitting earth.

Mass extinctions have wiped out entire species and leave habitats open for new ones. One theory for how dinosaurs became extinct is a huge meteor hitting earth.

EvolutionEvolution

Convergent Evolution is when organisms start to look like each other.

Coevolution is when two different species evolve because of changes in each other.

Convergent Evolution is when organisms start to look like each other.

Coevolution is when two different species evolve because of changes in each other.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

How Life Has ChangedHow Life Has Changed

Life has changed very much over time, all the way from very simple, single celled organisms, to extremely complex, multicellular organisms such as Humans.

Life has changed very much over time, all the way from very simple, single celled organisms, to extremely complex, multicellular organisms such as Humans.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.