BY JAYNE ATHERTON
IT MAY not rank among most people's favourite things but death has made it
into a list of nature's greatest hits.
Scientists have chosen the definitive top ten of nature's creations ranging
from the eye to the brain, for the New
Scientist magazine.
Top of the list is multicellularity: a trick of
DNA
which allows different cells to specialise in specific tasks. Without it,
complex creatures -including people -could
not exist.
The eye, in second place, first appeared 543million years ago, when trilobites
first gazed upon the world.
The brain, which is credited with lifting us 'above the
level of vegetation' comes next, with photosynthesis, the process which allows
organisms to turn sunlight into fuel, in fourth
place.
Language comes next, followed by
sex, which,
in scientific terms, is a waste of time and energy. Thankfully, nature is
not such a kill-joy - and anyway, sexual reproduction
allows for genetic variation and evolution.
Also in the list are symbiosis, which allows two species to live off one
another, parasites, ranging from viruses to mosquitoes, and superorganisms,
such as the Portuguese man-of-war.
Finally there's the Grim Reaper himself.Death
allows cells to self-destruct so the body can develop and regenerate
itself.And one theory suggests an
in-built
ageing programme sets an upper limit on our lifespans, ensuring we do
not outstay our welcome.
[Metro Apr11,2005]
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By Suzy Austin
It may look like it has been Tangoed,but this
turtle's unusual colour is down to a strange twist of nature.
The soft-shelled turtle - which would be brownish green or tan
under normal circumstances - was found in Yangzhou,China.
Scientists believe the female turtle is bright
orange thanks to a gene deformity.The turtle
is certainly not the first animal to sport
unusual colour through mutation.
Gene abnormalities occasionally also create albinos,which lack pigment
and have white skin and hair.
Other colour mutations include a striking scarlet ibis,more commonly black
and white. And one family believed they had stumbled upon an exotic
species when they found a strangely-coloured frog in their garden pond
in a South Yorkshire village.
It was only when they took it to an expert that they found
it was a common garden frog with a colourful gene
thrown in. [Metro Apr20,2005]. |
Tale Gator: The albino alligator pictured on Wednesday
is not an albino. The trait is, in fact,leucistic.If it had been
an albino,the pattern in its skin would have been present,
as well as the characteristic pink eyes.Leucistic
animals are not albino and should not be confused with such.The
peacock that appears in the article is also leucistic.
Joe Killick,Huddersfield. [Metro Apr21,2005]
'Hobbits' ruled paradise isle
BY SARAH HILLS
THEY were barely 1m tall, round-faced and hollow-eyed - creatures eerily
rerniniscent of Tolkien's hobbits from The Lord of The Rings. But these were
not intelligent, gentle, pipe-smoking denizens of Middle Earth.
They were tiny humans, who, despite having brains a quarter the size of modern
man, used stone tools and hunted.
Scientists who uncovered their remains, hailed it one of the most spectacular
fossil finds in decades. Fragments from the primitive individuals, who lived
until 12,000 years ago, were found on the Indonesian island of Flores. They
inhabited a kind of tropical lost world, populated by giant lizards and miniature
elephants. Radiocarbon dating revealed some specimens to be 95,000 years
old. One l8,000 year-old skeleton, of an adult female, was found near stone
tools and charred animal bones, suggesting she cooked.
Experts believe Flores Man descended from the full-sized forebears of modern
hurnans. Australian experts who found the creatures told the journal
Nature they shrank over the years, in
part, because they did not need to remain tall to tackle natural predators.
Prof Bert Roberts, of Wollongong University, said: 'We now have the remains
of at least seven hobbit-sized individuals at the cave site, so the skeleton
cannot be some kind of freak.'
[Metro Oct28,2005]
The Riddle of The Human Hobbits: An Equinox Special
Delving into the science behind last year's tabloid frenzy, The Riddle
of The Human Hobbits began, in true 'ooooh- Secrecy- Lost world! Genetic
conspiracy" style with boffins stalking purposefully down shadowy, X Files-lit
corridors to click open a Spy-Catcher metal briefcase. Despite my immense
disappointment that the metal briefcase did not reveal a tiny lost tribe
of woolly-toed folk, chanting 'riddle-me-ree' and blowing smoke rings, but
a small, mouldy-looking skull from Indonesia, this mind-blowing, 'wow - world
of wonder!' doc was still hugely absorbing and great fun. Much of the fun
was due to Prof Bert Roberts, one of the original Aussie archaeologists who
unearthed Flo, the hobbit lady whose diminutive metre-high stature and titchy
brain proved evolution-busting evidence of an entire new species.
A kind of cheery Wollongong University version of Michael Palin, Bert was
happy to give us facts in a way we understood, clarifying the importance
of the find while proving his professionalism by the ability to say 'homo
erectus' repeatedly without giggling like a schoolboy.
[Metro May3,2005]
Until very recently, evolutionary thought was couched in terms of a linear,
progressive trajectory rising from lower life forms and culminating in man.
I have argued elsewhere that this view is not, regrettably, as extinct as
it should be.
In palaeoanthropology, this idea is seen in the view that only one species
of hominid has existed at any one time, each one succeeding the next in a
scheme of orderly replacement. This idea began to crumble in the 1970s, since
when discoveries of ancient relatives of humans have revealed a marked diversity
of form. Human evolution is like a bush, not a ladder.
But these discoveries concerned the more remote reaches of human ancestry.
Despite the fact that some of our relatives, such as Neanderthal man and
Homo erectus, are thought to have become extinct in relatively recent times,
our complacency that this view holds for recent history has not been shaken.
Until now. If it turns out that the diversity of human beings was always
high, remained high until very recently and might not be entirely extinguished,
we are entitled to question the security of some of our deepest beliefs.
Will the real image of God please stand up?
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