BBC Nature - History of life on Earth SAPS Student Resources Homepage Frontpage Slideshow | Copyright © 2006-2010 JoomlaWorks, a business unit of Nuevvo Webware Ltd. SAPS Student Resources Homepage Find out where a career in biology might take you with this collection of case studies - 10 biologists take us through their daily routine, share their advice and tell us how they got into their current job. Find out more Are you planning to do an extended project on a topic in biology? See the project ideas
The Radix Endeavor Timeline: The evolution of life - life - 14 July 2009 Read full article Continue reading page |1|2|3|4 There are all sorts of ways to reconstruct the history of life on Earth. Pinning down when specific events occurred is often tricky, though. For this, biologists depend mainly on dating the rocks in which fossils are found, and by looking at the "molecular clocks" in the DNA of living organisms. There are problems with each of these methods. Modern genetics allows scientists to measure how different species are from each other at a molecular level, and thus to estimate how much time has passed since a single lineage split into different species. These difficulties mean that the dates in the timeline should be taken as approximate. 3.8 billion years ago? This is our current "best guess" for the beginning of life on Earth. , and was probably based on RNA rather than DNA. At some point far back in time, a common ancestor gave rise to two main groups of life: bacteria and archaea. 3.5 billion years ago 3.46 billion years ago 3.4 billion years ago
WELCOME to DOC BROWN'S SCIENCE Biology Chemistry Physics gcse igcse A level HOMEPAGE docbrown chemhelp iphone ipad notepad notebook netbook epad tablet android NOT apps Biology Labs - OnlineLabs.in - Virtual laboratory simulations for science education Below is a list of freely available online biology lab resources, including microscopy, genetics and life science. General biology and virtual labs The Interactive Library – This EdInformatics.com site is a list of links to interactive biology sites. Anatomy, physiology and dissection See the list of Anatomy Labs Microscopy, cells and microbiology Genetics and DNA Health, medical treatment and blood types Interactive Health Tutorials – From U.S. Population biology and dynamics Animal behavior, evolution and life science The Animal Behavior Project – At the University of ArizonaLife Science – Interactive lessons from learningscience.comShedd Educational Adventures – Marine life resources from the Shed AquariumPaleo Pursuit – A game from The Virtual Museum of CanadaENSI/SENSI – Evolution and the Nature of Science InstitutesIlluminating Photosynthesis – PBS interactive tutorial about photosynthesis; not a lab activity Commercial products Return to the List of Subjects.
GCSE Bitesize: Darwin's theory of evolution Virtual Microscope STAR: Genetics - Home StarGenetics is a Mendelian genetics cross simulator developed at MIT by biology faculty, researched-trained scientists and technologists at MIT's OEIT. StarGenetics allows students to simulate mating experiments between organisms that are genetically different across a range of traits to analyze the nature of the traits in question. Its goal is to teach students about genetic experimental design and genetic concepts. For more information on StarGenetics click here. Using StarGenetics StarGenetics is freely accessible via the web. Overview StarGenetics can be used to teach simple genetics concepts that are appropriate for high school biology students as well as complex genetics concepts that are appropriate for advanced biology undergraduate students.In addition,StarGenetics allows for instructors to customize the exercises presented to the student. Cow Fish Fly Peas Smiley Face Yeast
Beagle Voyage 26 December 1831 - to - 27 February 1832 Crossing the Atlantic Ocean: H.M.S. Beagle leaves Plymouth Harbor A tour of the Madeira and Canary islands Landfall at the Cape Verde islands The weather was now quite fine and the Beagle was ready to set sail on 26 December. "Never, I believe, did a vessel leave England better provided, or fitted for the service she was destined to perform, and for the health and comfort of her crew, than the Beagle. The Beagle arrived near Madeira Island, its first port-of-call, on 4 January 1832. Capt. "This was a great disappointment to Mr. H.M.S. Darwin made detailed observations of a cuttle-fish that populated the tide pools around the island, and was fascinated by their ability to change colors. Darwin's Discovery: It was on Santiago that Darwin made his first curious discovery. The Beagle left Santiago on 7 February and sailed towards Brazil, stopping for one day St.
What is DNA and how does it work? Human Evolution Evidence Scientists have discovered a wealth of evidence concerning human evolution, and this evidence comes in many forms. Thousands of human fossils enable researchers and students to study the changes that occurred in brain and body size, locomotion, diet, and other aspects regarding the way of life of early human species over the past 6 million years. Millions of stone tools, figurines and paintings, footprints, and other traces of human behavior in the prehistoric record tell about where and how early humans lived and when certain technological innovations were invented. Exciting scientific discoveries continually add to the broader and deeper public knowledge of human evolution.