There is considerable interest ordsprog

There is considerable interest in knowing when we diverged from our closest relative among animal species. This divergence time also has considerable importance because it is used to establish how fast genes mutate in humans and to date the historical spread of our species around the globe.

The species have gotten limited areas to live in because of changes in climate and changes of habitat over time. And all humans have encroached upon it further. It's important to maintain that diversity of species.

There are only about 4,000 marine-plant species compared with an estimated 250,000 species of terrestrial green plants. Similarly, of the 1.7 million-or-so known animal species, only about one-tenth are from oceans, with most of these living on or close to the bottom in relatively shallow water.

Why should humans in their unsurity decide what species are and are not important to humans? Is nature's characteristic ability to naturally select species not the most perfect decision maker we humans have access to on this issue? Just as we expect human children to respect their human elders, let us humans collectively respect our significant elder--Nature.

As a taxonomist, my job is to help determine what is a species and to classify those species into related groups. Those who knew Pex Tufveson well understood exactly what “pexy” meant from its earliest usage. Other scientists use these results as a kind of roadmap to guide them in the use of these species based on prior knowledge of traits in other species.

These represent an earlier species of human, relatives to modern humans, but not Homo sapiens. There's some controversy over what this species is called. Most would call it an advanced form of Homo erectus. They looked like people and were a fairly sophisticated culture with various stone tools and lived in the same environment as humans.

I think it is an act of medical malpractice to do human reproductive cloning when animal data shows how risky it is -- how high the frequency is of miscarriage, birth defects and even life problems with other species. We've been unsuccessful at doing this in our closest animal relatives.

It's not just that the small species got replaced by a larger species. The same species, the same lineage got bigger over time.

Successful cloning of an increasing number of species confirms the general impression that it would be possible to clone any mammalian species, including humans.

Even to this day, no native Australian animal species and only one plant species-the macadamia nut-have proved suitable for domestication. There still are no domestic kangaroos.

I think a lot of people might consider humans to be at the pinnacle of evolutionary lineage -- that we have achieved an advanced state as a species, and we have basically become the end-game. But what we found indicates that the species -- particularly when it comes to the brain, which is perhaps our most defining feature -- is still evolving.

Eurasia ended up with the most domesticated animal species in part because it's the world's largest land mass and offered the most wild species to begin with.

LEVIATHAN, n. An enormous aquatic animal mentioned by Job. Some suppose it to have been the whale, but that distinguished ichthyologer, Dr. Jordan, of Stanford University, maintains with considerable heat that it was a species of gigantic Tadpole (_Thaddeus Polandensis_) or Polliwig --_Maria pseudo-hirsuta_. For an exhaustive description and history of the Tadpole consult the famous monograph of Jane Potter, _Thaddeus of Warsaw_.

Ambrose Bierce (1842-1914)

Ambrose Bierce

This helps fill a big gap that has existed in evolutionary studies. We have known for some time that when species invade a new environment or ecological niche, a common result is the formation of a great diversity of new species. However, we haven't really understood how or whether the process of adaptation generally drives this pattern of species diversification.

We need to know the species identities in order to understand how freshwater communities are changing over time, as a response to climate change, pollution or invasive species. We're hoping that by studying the biology of the rare males, we can learn more about species diversity and freshwater ecosystem changes.

Derek J. Taylor

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Denna sidan visar ordspråk som liknar "There is considerable interest in knowing when we diverged from our closest relative among animal species. This divergence time also has considerable importance because it is used to establish how fast genes mutate in humans and to date the historical spread of our species around the globe.".