Tree of life

Definition

The Tree of Life represents the evolutionary relationships among various species on Earth, illustrating how all life forms are interconnected. It traces the lineage of species back to common ancestors, highlighting the unity and diversity of life.

5 Must Know Facts For Your Next Test

1. The Tree of Life illustrates the evolutionary pathways that led to the diversity of species we see today.
2. It is rooted in a common ancestor shared by all living organisms, suggesting a single origin of life.
3. Genetic similarities and differences among species help scientists map out branches in the Tree of Life.
4. The concept supports the theory of evolution through natural selection as described by Charles Darwin.
5. In astronomy, understanding life's evolution on Earth can inform the search for extraterrestrial life by identifying universal biological markers.

Review Questions

• What does the root of the Tree of Life represent?
• How do genetic similarities among different species support the structure of the Tree of Life?
• Why is the concept of the Tree of Life relevant to astrobiology?

Related terms

Evolution: The process through which species undergo genetic change over time, leading to adaptation and diversification.

Common Ancestor: A shared ancestor from which multiple species have evolved over time.

Natural Selection:

The mechanism by which individuals better adapted to their environment tend to survive and reproduce more successfully.