Radioactive Dating Game

It was used again in in a work entitled Philosophiae naturalis sive physicae: The first German use, Biologie, was in a translation of Linnaeus’ work. The term came into its modern usage with the six-volume treatise Biologie, oder Philosophie der lebenden Natur —22 by Gottfried Reinhold Treviranus , who announced: The science that concerns itself with these objects we will indicate by the name biology [Biologie] or the doctrine of life [Lebenslehre]. Although modern biology is a relatively recent development, sciences related to and included within it have been studied since ancient times. Natural philosophy was studied as early as the ancient civilizations of Mesopotamia , Egypt , the Indian subcontinent , and China. However, the origins of modern biology and its approach to the study of nature are most often traced back to ancient Greece.

Kingdom (biology)

At Coffee Meets Bagel, we get to test a lot of theories about human relationships, using our superpowers of data, statistics, and nosiness. How to read this chart nerds, skip this: Green blocks are where women really like men. For example, 22 year old women really like year old guys. There are a few trends to note here.

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This one is called The Biology of Skin Color , and it is another winner. It is narrated by Nina Jablonski, who did much of the research cited in the video. Those of you who use my Biology: Screenshot from The Biology of Skin Color The video begins by showing off the rich variety of human skin colors, then it briefly explains the physics of light reflection. Jablonski then talks about the role of melanin: The next chunk of the video explains how Jablonski and her geographer husband discovered the correlation between solar UV exposure and skin pigmentation in indigenous peoples from around the world.

Jablonski introduces a colleague who sequenced DNA and discovered that a particular pigmentation-related gene, MC1R, shows little variation in Africa, suggesting strong selection against alleles conferring light skin. What is the selective pressure? Jablonski explains that humans need some exposure to UV radiation to make vitamin D. The selective pressure for dark skin therefore abates at higher latitudes, where UV radiation is weaker. As evidence, she points to indigenous people from northern latitudes, who have darkly pigmented skin but also consume diets that are high in vitamin D.

Overall, the video depicts skin color variation around the world as an evolutionary balancing act. We have to use cultural adaptations — like sunscreen and vitamin D supplements — to compensate.

Evolutionary biology

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Archaebacteria , Chromista , and Archezoa Thomas Cavalier-Smith thought at first, as it was nearly consensually admitted at that time, that the difference between eubacteria and archaebacteria was so great particularly considering the genetic distance of ribosomal genes that they needed to be separated into two different kingdoms, hence splitting the empire Bacteria into two kingdoms. He then divided Eubacteria into two subkingdoms: Negibacteria Gram negative bacteria and Posibacteria Gram positive bacteria.

Technological advances in electron microscopy allowed the separation of the Chromista from the Plantae kingdom. Indeed, the chloroplast of the chromists is located in the lumen of the endoplasmic reticulum instead of in the cytosol. Moreover, only chromists contain chlorophyll c. Since then, many non-photosynthetic phyla of protists, thought to have secondarily lost their chloroplasts, were integrated into the kingdom Chromista. Finally, some protists lacking mitochondria were discovered.

As a result, these amitochondriate protists were separated from the protist kingdom, giving rise to the, at the same time, superkingdom and kingdom Archezoa. This was known as the Archezoa hypothesis. This superkingdom was opposed to the Metakaryota superkingdom, grouping together the five other eukaryotic kingdoms Animalia , Protozoa , Fungi , Plantae and Chromista.

Six kingdoms[ edit ] In , Cavalier-Smith published a six-kingdom model, [3] which has been revised in subsequent papers.

The Science of Online Dating

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Arxiu d’etiquetes: dating

But what is exactly a fossil and how is it formed? Have you ever wondered how science knows the age of a fossil? Read on to find out! If you think of a fossil, surely the first thing that comes to your mind is a dinosaur bone or a petrified shell that you found in the forest, but a fossil is much more. So, there are different types of fossils: Petrified and permineralized fossils:

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Evolution within a Lineage

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The obvious components are the overall layout, ease of navigation, choice of font, incorporation of eye-catching images, and how well the text is seeded with those all-important keywords to draw visitors via search engines. But one of the most fundamental of all is much more elementary. In order for your site to attract maximum web traffic, it must have an appropriate color scheme.

Here are some of the reasons why this is so important. How we react to colors Before studying which colors would best tie in with a niche-specific area like online dating, it would be worth taking an overview of the subject. Color is a vital element of giving us an impression about something, and this is down to biology. When we see any color, a particular part of our brain reacts, resulting in a rush of hormones being released.


Dating Here of some of the well-tested methods of dating used in the study of early humans: Potassium-argon dating, Argon-argon dating, Carbon or Radiocarbon , and Uranium series. All of these methods measure the amount of radioactive decay of chemical elements; the decay occurs in a consistent manner, like a clock, over long periods of time. Thermo-luminescence, Optically stimulated luminescence, and Electron spin resonance.

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The Biological Reasons Why She Or He Is Not That Into You

For other time ranges, you’d have to use another isotope. I’m not an expert, but I think it would just come out as “within years old”. But yes, for any form of destructive testing, such as radiocardon dating, they usually use other methods to gauge the age of the artifact or specimen.

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The History of Life on Earth – Crash Course Ecology #1