When Did Grass Evolve?
When did grass evolve? Grass first appeared around 55 to 65 million years ago. After the extinction of dinosaurs, grasses quickly spread.
Evolution and Tree of Life
Butterfly Lifecycle Stages and Processes
The butterfly lifecycle is a process of change and growth. It goes through four main stages: egg, caterpillar, chrysalis, and butterfly.
The 5 Classes of Vertebrates
Grouping animals into classes of vertebrates allows us to categorize the incredible diversity on Earth and their evolutionary histories.
Human Evolution: A Timeline of Early Hominids [Infographic]
Since about 4 million years ago, humans have evolved from early hominids to modern humans. Here are 14 species examples from human evolution now extinct.
Endosymbiosis: The Origin of Eukaryotic Cells
Endosymbiosis sparked the origin of eukaryotic cells. It’s the idea that a prokaryote engulfed a bacteria and became mitochondria part of eukaryotic cells.
Human Timeline: How Long Have Humans Existed?
The earliest anatomically modern human fossil found was dated at about 200-300,000 years old in Morocco, Africa. They had modern faces and used stone tools.
Theory of Evolution: Charles Darwin and Natural Selection
In flesh and blood, you have been genetically fine-tuned as a product of natural selection. Without evolution, complex beings like humans wouldn’t exist.
LUCA: Last Universal Common Ancestor
All living things originated from a common ancestor called the last universal common ancestor (LUCA). The origin of life existed before LUCA (3.5 – 4.1 bya)
The Dinosaur Era: When Dinosaurs Dominated
If you rewind the clock 230 million years back, dinosaurs dominated the land. Not just for a short span of time. But they lived for over 175 million years!
Carbon Dating: How Radioactive Isotopes Estimate Age
All life contains types of carbon. When an organism dies, carbon dating examines the ratio between carbon-14 (C14) and carbon-12 (C12) to estimate age.