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Timeline of evolutionary history of life

Timeline of evolutionary history of life
Visual representation of the history of life on Earth as a spiral The dates given in this article are estimates based on scientific evidence. Basic timeline[edit] In its 4.6 billion years circling the sun, the Earth has harbored an increasing diversity of life forms: Periodic extinctions have temporarily reduced diversity, eliminating: Dates are approximate. Detailed timeline[edit] In this timeline, Ma (for megaannum) means "million years ago", ka (for kiloannum) means "thousand years ago", and ya means "years ago". Hadean Eon[edit] 4000 Ma and earlier. Archean Eon[edit] 4000 Ma – 2500 Ma Proterozoic Eon[edit] 2500 Ma – 542 Ma Phanerozoic Eon[edit] 542 Ma – present The Phanerozoic Eon, literally the "period of well-displayed life", marks the appearance in the fossil record of abundant, shell-forming and/or trace-making organisms. Paleozoic Era[edit] 542 Ma – 251.0 Ma Mesozoic Era[edit] Cenozoic Era[edit] 66 Ma – present Historical extinctions[edit] See also[edit] Further reading[edit] References[edit]

http://en.wikipedia.org/wiki/Timeline_of_evolutionary_history_of_life

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Evolutionary history of plants A late Siluriansporangium. Green: A spore tetrad. Blue: A spore bearing a trilete mark – the Low Back Pain Exercises Exercises that stretch and strengthen the muscles of your abdomen and spine can help prevent back problems. Strong back and abdominal muscles help you keep good posture, with your spine in its correct position. If your muscles are tight, take a warm shower or bath before doing the exercises. History of the Earth The history of the Earth concerns the development of the planet Earth from its formation to the present day.[1][2] Nearly all branches of natural science have contributed to the understanding of the main events of the Earth's past. The age of Earth is approximately one-third of the age of the universe. An immense amount of biological and geological change has occurred in that time span.

Timeline of plant evolution This article attempts to place key plant innovations in a geological context. It concerns itself only with novel adaptations and events that had a major ecological significance, not those that are of solely anthropological interest. The timeline displays a graphical representation of the adaptations; the text attempts to explain the nature and robustness of the evidence.

Yoga may work better for lower back pain than conventional treatments | Science Doing yoga is a more effective way for people with lower back pain to become more mobile than the treatments currently offered by GPs, according to new research. The study found that back pain sufferers recorded greater improvements in everyday physical tasks such as walking, bending down and getting dressed if they did weekly yoga sessions. Participants who had practised yoga reported enhanced function compared with those receiving standard care, even nine months after the yoga classes had finished. Previous, smaller studies have suggested yoga could be beneficial to back pain sufferers. However, these have often involved just one teacher and have not included long-term follow-up. Back pain is estimated to affect 80% of adults at some point in their lives, and one in five people visits their GP in any given year because of it.

Geological history of Earth Geologic time represented in a diagram called a geological clock, showing the relative lengths of the eons of Earth's history and noting major events The geological history of Earth follows the major events in Earth's past based on the geologic time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System. As the surface continually reshaped itself over hundreds of millions of years, continents formed and broke apart. They migrated across the surface, occasionally combining to form a supercontinent. Roughly 750 million years ago, the earliest-known supercontinent Rodinia, began to break apart.

Geological history of Earth Geologic time represented in a diagram called a geological clock, showing the relative lengths of the eons of Earth's history and noting major events The geological history of Earth follows the major events in Earth's past based on the geologic time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System. As the surface continually reshaped itself over hundreds of millions of years, continents formed and broke apart.

Dandelion Please Share This Page: Other names for Dandelion, past or present: English - Swinesnout, Dashelflower, Pissa-bed Latin - Taraxacum officinale; also Taraxacum Leontodon, Dens LeonisFrench - Dents de LyonGerman - Löwenzahn. (Pfaffenblatt, Runnichstopff - archaic)Dutch - PapencruytSpanish - Diente de LionItalian - Dente di Cane, Piscia al letto Dandelion (Taraxum officinale / Taraxacum erythrospermum) is a very well known plant that grows all over the world. Loved especially by childred, it is famous for its bright yellow flower head, white seed head (consisting of numerous tiny "seed parachutes") and its bright green serrated leaves. Geologic time scale The geologic time scale (GTS) is a system of chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and other earth scientists to describe the timing and relationships between events that have occurred throughout Earth's history. The table of geologic time spans presented here agrees with the nomenclature, dates and standard color codes set forth by the International Commission on Stratigraphy. Evidence from radiometric dating indicates that the Earth is about 4.54 billion years old. The geology or deep time of Earth's past has been organized into various units according to events which took place in each period. Different spans of time on the GTS are usually delimited by changes in the composition of strata which correspond to them, indicating major geological or paleontological events, such as mass extinctions.

History of the Earth The history of Earth concerns the development of the planet Earth from its formation to the present day.[1][2] Nearly all branches of natural science have contributed to the understanding of the main events of the Earth's past. The age of Earth is approximately one-third of the age of the universe. An immense amount of geological change has occurred in that timespan, accompanied by biological change. The geological time scale (GTS) clock (see graphic) depicts the larger spans of time from the beginning of the Earth as well as a chronology of some definitive events of Earth history. The Hadean Eon represents time before the reliable (fossil) record of life beginning on Earth; it began with the formation of the planet and ended at 4.0 billion years ago as defined by international convention.[6] The Archean and Proterozoic eons follow; they produced the abiogenesis of life on Earth and then the evolution of early life.

Six natural alternatives to ibuprofen - Phoenix Alternative Medicine The saying used to be, “Take two aspirin and call me in the morning,” but many people turn to ibuprofen to relieve inflammation, pain, and fever. This nonsteroidal anti-inflammatory drug (NSAID), available both over the counter and by prescription, is commonly used to treat arthritis, menstrual symptoms, headache, general aches and pains, and various inflammatory conditions. Side effects of ibuprofen Although many people think of ibuprofen as being rather benign, it is associated with an increased risk of heart and circulation problems, including stroke and heart attack, as well as gastrointestinal problems, such as bleeding or perforation of the stomach or intestinal tract. These risks increase the longer you take the drug, although the length of time until it affects any one individual varies depending on their overall health, use of other medications, age, and other factors.

Plastic particle water pollution A large portion of marine debris consists of plastic particles, including nurdles, pre-production microplastic resin pellets typically under 5 mm (0.20 in) in diameter found outside of the typical plastic manufacturing stream and an intermediate good used to produce plastic final products;[1] microbeads from cosmetics; and the breakdown products of plastic litter. Plastic particle water pollution is also referred to as mermaids' tears.[2] Approximately 60 billion pounds (27 million tonnes) of nurdles are manufactured annually in the United States.[3] One pound of pelletized HDPE contains approximately 25,000 nurdles (approximately 20 mg per nurdle). Environmental impact[edit] Nurdles are a major contributor to marine debris.

Evolutionary history of life The evolutionary history of life on Earth traces the processes by which living and fossil organisms have evolved since life appeared on the planet, until the present day. Earth formed about 4.5 Ga (billion years ago) and life appeared on its surface within 1 billion years. The similarities between all present-day organisms indicate the presence of a common ancestor from which all known species have diverged through the process of evolution.[1] More than 99 percent of all species, amounting to over five billion species,[2] that ever lived on Earth are estimated to be extinct.[3][4] Estimates on the number of Earth's current species range from 10 million to 14 million,[5] of which about 1.2 million have been documented and over 86 percent have not yet been described.[6] Outline[edit]

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