Evolution: It's a Thing - Crash Course Biology #20

Front

What do all living things on Earth have in common?

Back

All species use RNA or DNA to carry their genetic information.

Front

What do scientists mean when they use the term 'theory'?

Back

Theories are ideas that explain natural phenomena.

Front

What causes a population to evolve?

Back

A selective pressure changes the gene distribution of the population over time.

Front

What does the fossil record suggest about species?

Back

Species change over time.

Front

What do homologous structures indicate about different species?

Back

The bones suggest humans and bats share a common ancestor.

Front

What is evolution?

Back

Evolution is the process through which species change over time through genetic variation and natural selection.

Front

What is a vestigial organ?

Back

A vestigial organ is a body part that has lost its original function through the course of evolution.

Front

What is natural selection?

Back

Natural selection is the process where organisms better adapted to their environment tend to survive and produce more offspring.

Front

What is the significance of genetic variation in a population?

Back

Genetic variation is crucial for a population's ability to adapt to changing environments.

Front

What is a common misconception about evolution?

Back

A common misconception is that evolution is a linear process leading to 'better' species.