Evolution CRASH COURSE Part 1

Modern day giraffes

Giraffes with medium necks

Original short-necked ancestor

Giraffes with no necks

There would be more resources for everyone

Technology would solve all problems

There would be insufficient living space and food

Governments would control the population

The earth would be underpopulated

The earth would be overpopulated

The earth would remain balanced

The earth would have no change

December 27th, 1831

October 2nd, 1836

September 15th, 1835

January 1st, 1832

Their speed

Their diet

Their shells indicated their island of origin

Their size

They were uniform across the globe.

They showed no unique adaptations.

They were diverse and showed unique adaptations.

They were only found in Australia.

Both can fly.

Both can glide.

Both are found in Australia.

Both are found in North America.

All organisms are identical.

Organisms show patterns of diversity.

Organisms are only found in one region.

Organisms have no unique adaptations.

Species that are still alive

Species that no longer exist

Species that are endangered

Species that are thriving

They are all exactly alike.

They vary extensively with no two individuals being exactly alike.

They are similar in every characteristic.

They have no variation at all.

Increased biodiversity

Struggle for existence

Decreased competition

Unlimited resources

All individuals survive

Only a fraction of offspring survive

Resources are unlimited

No competition exists