Stars
.... to exactly a factor of 100 in intensity.
Absolute magnitudes are how bright a star would appear from some standard
distance, arbitrarily set as 10 parsecs or about 32.6 light years. Stars can be
as bright as absolute magnitude -8 and as faint as absolute magnitude +16 or
fainter. There are thus (a very few) stars more than 100 times brighter than
Sirius, while hardly any are known fainter than Wolf 356.
Star, large celestial body composed of gravitationally contained hot gases
emitting electromagnetic radiation, especially light, as a result of nuclear
reactions inside the star. The sun is a star. With the sole exception of the .....
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Carnivorous Plants
.... plant
growth and development. Water, carbon dioxide, nutrients and minerals are also
needed for survival. In wetlands, where stagnate water contains acidic
compounds and chemicals from decaying organic matter many plants have a
difficult time obtaining necessary nutrients. It is in these nutrient poor
conditions that some plants evolved different ways of obtaining nutrients. The
ability of carnivorous plants to digest nitrogen -rich animal protein enables
these plants to survive in somewhat hostile environments.
The evolution of carnivorous plants is speculative due to the paucity of
the fossil record. It is believed that .....
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Cells
.... is used for sorting, storing, and secretion
for the cell. Next are lysosomes, which hydrolyze macromolecules. Then there
are centrioles that play a major role in cell division. And lastly there are
vacuoles which have a variety of storage functions.
The plant cell is similar in most ways. The only really big differences
between the plant cell and the animal cell are as follows. The first is the
outer membrane. The plant cell has a cell wall that highly acts as support to
the cell, where the animal cell has a more flexible, softer outer membrane.
Also in the plant cell are chloroplasts, which are not in the animal cell.
Chloro .....
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Damn Near Everything There Is To Know About Cells:
.... organs. An organ system is a group of organs that work together to
carry out major life functions.
Eukariotic Cell Structure:
Boundaries and Control:
Plasma Membrane - The plasma membrane is sometimes called the cell membrane, or
the cellular membrane. It is the outermost part of the animal cell, and it's
purpose is to enclose the cell, and change shape if needed. The cell membrane
is capable of allowing materials to enter and exit the cell. Oxygen and
nutrients enter, and waste products such as excess water leave. The plasma
membrane helps maintain a chemical balance within the cell.
Cell wall - The cell wall is an adde .....
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History Of The Cell Theory
.... Cells are the basic units of structure and function in organisms
3. All cells come from preexisting cells.
The impact on science was very great due to the discovery of cells and
the cell theory. Many or all things were effected by the discovery of cells,
everything was looked upon in a different way. Some people still did not
believe that all living organisms were made of tiny microscopic chambers called
cells. Many people thought that people that believed in cells were insane, some
people even wanted to put Antoni van Leeuwenhoek in an insane asylum because he
believed in cells. As you can see the impact of cells was ver .....
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Stephen J. Hawking By Rachel Finck
.... stand as a complete, consistent theory of the physical interactions that
would describe all possible observations. Our attempts at modeling physical
reality normally consists of two parts: a) A set of local laws that are obeyed
by the various physical quantities, formulated in terms of differential
equations, and b) Sets of boundary conditions that tell us the state of some
regions of the universe at a certain time and what effects propagate into it
subsequently from the rest of the universe. Presently, physicist are still
trying to unify two separate theories to describe everything in the universe.
The two theories are t .....
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Chimpanzee Versus Humans: Similarities & Differences
.... evolved into making complex tools and
we became increasingly sophisticated. The human skull is slightly different
from that of our primate ancestors, these changes occurred over thousands of
years of evolution. Over time the humans skull and teeth have decreased from
that of our ancestors. The chimp has much larger canine teeth and a protruding
jaw line. A similarities though can be seen on how uniform the layout of teeth
are between the humans and chimps, both possess canines, premolars, and molars.
Other notable similarities between us and the primates, specifically the
chimps is the use of an opposable digit, a thumb. The .....
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Astrology
.... continues its path
through the remaining eleven signs. The twelve signs of the zodiac are: Aries,
Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn,
Aquarius, and Pisces.
The moon and the planets pass through the signs too, but obviously at
different speeds from those of the sun. The moon, which is close to the earth,
circles the zodiac in twenty-nine days, while the planet Pluto needs two hundred
fifty years. Planets also can be seen to slow down, stop, and even reverse
directions in relationship to the constellations that they cross. In reality,
the planet inexorably continues along its way. But .....
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Cloning Of Animals
.... has made it possible for the cloning of almost any mammal,
including humans.
To the average person, exactly how the technique works is unclear.
Scientist predicted that by making cells dormant and bringing them close to
death, something happens to break the chemical locks (barriers) that keep most
of the genes inactive. The mammary cell is inserted into an unfertilized sheep
egg cell that has already had all of its own genetic material removed. By
fusing the cells together tricks the egg into thinking that it has become
fertilized.
After being fused together, researchers believe that the chemical
machinery inside .....
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Cloning Today
.... genetic information had been destroyed with ultraviolet light.
When the eggs were incubated, Gurdon discovered that only 1% to 2% of the eggs
had developed into fertile adult toads. The first successful cloning of mammal
was achieved nearly twenty years later. Scientists from Switzerland and the U.S.
successfully cloned mice using a method similar to Gurdon’s, but required one
extra step. After the nucleus was taken from the embryos of one type of mouse,
they were transferred into the embryos of another mouse who served as the
surrogate mother. This mouse went through the birthing process to create the
cloned mice. The cloni .....
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Cloning
.... contained the genetic disease. If this cloned embryo containd a disease
then one of the other embryos could be used for implantation in a parent, this
guarantees that the child would be free of genetic disease (Marshall 1025). For
those who disagree with cloning I am sure if there child could be saved from a
genetic disease they would reconsider cloning.
Imagine if one of your friends or family members was in need of a liver
or kidney. Most likely you would donate your own liver or kidney to save there
life. But then you are one organ short. Well this happens a lot and seems to
work fine. But if they needed a new heart you m .....
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Creationism Vs Evolution: Through The Eyes Of Jay Gould
.... the origins of human intellect as his proponents, Gould argues his opinion
in the favor of evolutionary thought.
In this essay titled "Natural Selection and The Human Brain: Darwin vs.
Wallace," Gould tells about the contest between Darwin and another prominent
scientist named Alfred Wallace over two important subjects. These topics, one
being sexual selection and the other about the origins of the human brain and
intellect were debated by men who generally held the same views on evolution.
However on these two subjects, Wallace chose to differ as he described it as his
"special heresy" (53). The first of these two ar .....
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