biology

Home/Tag: biology
16 09, 2017

What are snakes? Evolution and biology

By |2019-07-16T08:16:34-07:00September 16th, 2017|Biology|0 Comments

Two pythons: evolution of snakes When did snakes evolve? Snakes evolved from lizards only about 150 million years ago, during the Jurassic Period. This is during the time of the dinosaurs, about the same time that the first birds evolved from small dinosaurs. What about lizards? More about dinosaurs Evolution of birds The Jurassic period All our biology [...]

6 09, 2017

Human organs: medieval science

By |2019-09-15T21:13:36-07:00September 6th, 2017|Biology, Science|0 Comments

Chinese drawing of the human organs (about 1200) Eyes and fevers Between the Middle Ages and modern times, doctors have learned a lot of new things about how human bodies work. Earlier history of the human body History of medicine History of science All our biology articles The Islamic doctor al-Tabari, in the early 800s, [...]

6 09, 2017

Human body – history of medicine

By |2019-09-04T04:51:54-07:00September 6th, 2017|Science|0 Comments

Ebers Papyrus, one of the oldest known medical texts about the human body. From Egypt, about 1550 BC How does the human body work? Doctors have been trying to figure out how the human body works since the Stone Age, and there are still many things we don't know about the human body even [...]

6 09, 2017

What is cholera? History of disease and medicine

By |2019-04-01T05:55:51-07:00September 6th, 2017|Biology, Science|0 Comments

History of cholera: Washing clothes in the river (India) Where did cholera get started? Cholera (KOLL-uh-rah) is a very serious sickness. It probably first got started in India. History of disease Indian doctors and medicine All our India articles When did cholera first make people sick? People in India were dying of cholera by [...]

12 07, 2017

Who was Aristotle? – Greek philosophy

By |2019-09-14T06:38:55-07:00July 12th, 2017|Greeks|8 Comments

Who was Aristotle? An ancient Egyptian papyrus with a scrap of Aristotle's "Politics" Aristotle's family Aristotle's father was Nicomachus, a doctor who lived near Macedon, in the north of Greece. Ancient Greek doctors More Greek philosophy All our Ancient Greece articles His mother Phaestis was from Euboea. She probably worked from home. So, [...]

25 06, 2017

Triassic period – pine trees and pterodactyls

By |2019-09-20T12:29:31-07:00June 25th, 2017|Geology|0 Comments

A turtle in the desert During the Triassic period (about 248 to 199 million years ago), most of Earth's land continued to stick together in one big supercontinent, Pangaea. Because the middle of Pangaea was so far from the oceans, it was very dry there, like a desert. The whole world was generally [...]

25 06, 2017

Tertiary period – mammals and mountains

By |2019-09-20T12:42:36-07:00June 25th, 2017|Geology|2 Comments

Tertiary period: Large animals evolved like moose Dinosaurs become extinct The Tertiary period begins with the catastrophe that killed off the dinosaurs at the end of the Cretaceous Period, about 65 million years ago. And the Tertiary lasts down to 1.8 million years ago. Mammals become more common With nearly all of the dinosaurs [...]

25 06, 2017

Silurian period – Fish get jaws

By |2018-04-19T11:29:11-07:00June 25th, 2017|Biology, Geology|0 Comments

Silurian period: Trout swimming When was the Silurian period? The beginning of the Silurian period was about 443 million years ago. Some environmental problem at the end of the Ordovician period (probably ice ages) killed most of the plants and animals on Earth. The creatures that survived this extinction were the ones that [...]

24 06, 2017

Proterozoic Eon – eukaryotes to worms

By |2018-04-21T11:56:39-07:00June 24th, 2017|Biology, Geology|0 Comments

Two and a half billion years ago, the Archaean Eon ended and the Proterozoic Eon began. Trillions of prokaryote cells lived in Earth's oceans. Some of these cells could photosynthesize their energy from sunlight, water, and carbon dioxide. These photosynthesizing cells pooped out a lot of oxygen. By about 2.3 billion years ago, the iron [...]

3 06, 2017

Digestion – Oxidation reaction

By |2019-05-08T05:40:43-07:00June 3rd, 2017|Biology, Chemistry|2 Comments

Kids eating food (thanks to USDA) - get ready to digest food! How do you digest food? When animals, including people like you, digest their food, they use an oxidation reaction to break down big hydrocarbon molecules like sugar into different molecules. Cell digestion Digestive system What is an oxidation reaction? All our chemistry articles [...]