How did life originate? How did life originate? Living things (even ancient organisms like bacteria) are enormously complex. However, all this complexity did not leap fully-formed from the primordial soup. Instead life almost certainly originated in a series of small steps, each building upon the complexity that evolved previously: Simple organic molecules were formed. Simple organic molecules, similar to the nucleotide shown below, are the building blocks of life and must have been involved in its origin. Multicellularity evolved.
Homo erectus - H. erectus is a well known hominid IntroductionThroughout the early years of paleoanthropology, there were only two different species that were attributed to the genus Homo. These included the Neanderthals, and Homo erectus. In the early 1960s, this began to change, and human ancestry seemed to be populated by many different players. Accordingly, erectus is one of the better-known members of genus Homo, especially in terms of its well-established place in paleoanthropology. Some (e.g., M. The species was named by Eugène Dubois (it was originally designated as Pithecanthropus erectus) in 1894, after his 1891 find from Trinil, Java, in Indonesia (Trinil 2). The material was later associated with the Chinese material from Zhoukoudian, and renamed Homo erectus. Diagnostic Features The dates for erectus have become earlier and earlier, while habilis remains have been found in later and later deposits, making a lineage involving habilis ancestral to erectus increasingly unlikely. Bibliography Bräuer, G., and E.
Public Library of Science Biologija.com.hr - Vijesti - Biologija - Evolucija vidljiva tijekom samo jedne generacije Idući puta kada se nađete u prirodi dobro se osvrnite oko sebe. Ne samo da uživate u aktivnostima izvan kuće već vjerojatno svjedočite i evoluciji koja vam se odvija pred očima. Novo istraživanje objavljeno u časopisu Science početkom ovog mjeseca, a koje se bavi utjecajem kukaca na populacije biljaka, pokazalo je da se evolucija može dogoditi puno brže nego što se prije pretpostavljalo, čak tijekom samo jedne generacije. Znanstvenici sa Sveučilišta u Torontu, zajedno a suradnicima, izveli su eksperiment koristeći dvogodišnju pupoljku (Oenothera biennis), tipičnu samooprašivajuću biljku koja producira genetički identične potomke. Biljke su posadili na dva polja od kojih je svako u početku sadržavalo 60 biljaka sa 18 različitih genotipova (biljke koje sadrže različite setove mutacija). >>> Istraživanja na algama mijenjaju poznatu evoluciju biljaka Rezultati pokazuju da bi evolucija mogla biti važan mehanizam koji uzrokuje promjene u cijelom ekosustavu. Izvor: e!
Life on this Earth Just Changed: The North Atlantic Current is Gone Update: - Naval Research Laboratory Charts Show Damaged Loop Current - Jesse Ventura Conspiracy Theory: ‘Gulf Coast Oil Spill’ - Europe: Coldest Winter in 1,000 Years On Its Way, Connected To Gulf Stream Changes, Say Scientists - Global Cooling and the New World Order: The Bilderberg group discussion agenda in 2010:“The 58th Bilderberg Meeting will be held in Sitges, Spain 3 – 6 June 2010. Related article: - Loop Current in the Gulf of Mexico Has Stalled From BP Oil Disaster! I am not saying that you should panic now. I was thinking for a few days about whether I should post this article or not. This is just for your information. (Click on images to enlarge) The latest satellite data establishes that the North Atlantic Current (also called the North Atlantic Drift) no longer exists and along with it the Norway Current. The thermohaline circulation is sometimes called the ocean conveyor belt, the great ocean conveyor, or the global conveyor belt. Dr. A Normal Gulf Stream taken from 5 September2004.
Top 10 Signs Of Evolution In Modern Man Humans Through history, as natural selection played its part in the development of modern man, many of the useful functions and parts of the human body become unnecessary. What is most fascinating is that many of these parts of the body still remain in some form so we can see the progress of evolution. This list covers the ten most significant evolutionary changes that have taken place – leaving signs behind them. Goose Bumps Cutis Anserina Humans get goose bumps when they are cold, frightened, angry, or in awe. Jacobson’s Organ Vomeronasal organ Jacobson’s organ is a fascinating part of animal anatomy and it tells us a lot about our own sexual history. Junk DNA L-gulonolactone oxidase While many of the hangovers from our “devolved” past are visible or physical, this is not true for all. Extra Ear Muscles Auriculares muscles Early humans ate a lot of plants – and they needed to eat them quickly enough that they could eat a sufficient amount in one day to get all of the nutrients they needed.
Replication Structure Genome Reservoir CDC Releases Information about Ebola and Pets Americans love their pets. After Spanish authorities euthanized the dog of a nurse who contracted Ebola, many US pet owners became understandably concerned. When news leaked that an American nurse in Dallas with Ebola also had a dog, pet owners really got nervous. The Internet lit up with speculations, myths, and lots of wrong information regarding Ebola virus and animals. Veterinarians, including Dr. Jeff Werber and myself (among others), did their best to provide accurate and timely information, but blogs and social media can only do so much. How Ebola virus is spreadThe CDC is clear that a human or animal must be showing signs of Ebola in order to spread the infection. Through a cutThrough mucous membranes lining the eyes, nose, or mouthIn body fluids such as urine, saliva, vomit, feces, semen, and breast milkBy needles and syringes According to the CDC, Ebola has not been found to be transmitted through the air or in water. Can Dogs Get Ebola? Can I get Ebola from my dog or cat?