Ch. 1 Introduction - Concepts of Biology

Flashcards covering the origins of life and human history timelines as presented in the Concepts of Biology introduction.

Microorganisms

The first forms of life thought to have existed on Earth for billions of years before plants and animals appeared.

Mammals, birds, and flowers

Life forms that are considered relatively recent, originating between $130$ and $200$ million years ago.

Human habitation of Earth

The total time humans have lived on the planet, which is estimated to be the last $2.5$ million years.

Modern human appearance

The point in history, occurring $300,000$ years ago, when humans began looking like they do today.

NASA Earth image

A composite image made by scientists combining several satellite-based views of Earth to create a whole-planet observation.