... cell junctions. Cell junctions help maintain differences in the internal environment between adjacent cells, help anchor cells together, and allow cells to communicate with one another by passing small molecules from one cell to another. Groups of two or more tissues that function together make up 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. T ...
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... seek a greater understanding of the world, to know "why" we are not just "what" we are. The Greeks invented science and explored it in its truest form, philosophy. Through the years we have developed tools that we hope can prove or disprove various hypothesizes, to further our understanding of any number of things. We divide science into categories and then sub-divide it even farther, until we can hide the connections and pretend that they really are separate. The difference between psychology and physics is not as extreme as one would believe if they were to read their definitions. Though the means are different the goal is the same for all science: to increase ou ...
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... extinct. It is appalling to know that we are the main cause of this. Over fishing, pollution, over cutting, and an increase in population contribute to this problem. An example of this is the gold mining operation that we saw in the video. While mining, Mercury was dripping into the water. The mercury then got into the fish and into the humans who ate the fish. Biodiversity promotes a healthy environment. Environments rich in biodiversity are stronger and can with stand things such as drought, disease, and other stresses that environments that lack it cannot. In the video, during the drought, the side of the field with a more diverse environment held stern a ...
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... extracts, and is used in food preservation and in the preparation of pharmaceuticals. and its compounds play a key role in many of the important processes of life and industry. in the biosphere is essential in the processes of respiration and metabolism, the means by which animals derive the energy needed to sustain life. Furthermore, is the most abundant element at the surface of the Earth. In combined form it is found in ores, earth’s, rocks, and gemstones, as well as in all living organisms. is a gaseous chemical element in Group VA of the periodic table. The chemical symbol for atomic is O, its atomic number is 8, and its atomic weight is 15.9994. Elementa ...
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... An atom is made of little things called protons, nuetrons, and electrons. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. Electrons travel around the center of the atom, which is called the nucleus. Kind of like how Earth revolves around the sun. Protons and nuetrons make up the center of the atom. The atom has an atomic number. Scientists find that number by counting how many protons are in the nucleus. In this case Helium has two protons. Scientists find the average atomic mass by adding up protons and neutrons many times. Then they divide the total by how many times they tried this. This time Helium has an avera ...
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... tests, which, because the current tests are time consuming and technically difficult to do, are restricted to women over 35 and those who have a family history of chromosomal abnormalities. Prenatal tests using Willard's probes would be much simpler and faster to perform and could be available to all pregnant women who wish to take advantage of the technology. Current prenatal testing involves growing fetal cells in vitro and examining them, over one or two months, to see if there are two copies of a particular chromosome, which is normal, or one or three, which is abnormal. A test using Willard's probes would require only a few cells and a few days to d ...
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... Two separate processes result in the deposit of this sand and sediment on the shore. Most sediment is suspended in sea water and transported along the coast by the longshore current, a stream of water flowing parallel to the beach that is created by the action of waves breaking at an angle to shore. Longshore transport can deliver up to a million cubic yards of sediment annually to a single beach. In the second process, sand deposited onshore by the longshore current is then oscillated by waves breaking onto and receding from the beach. This continual onshore-offshore movement gradually pushes the sand along the beach edge. both the longshore transport of sedim ...
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... sometimes be difficult to distinguish whether or not someone has been exposed to the other form of , genital . This is because there are very often no symptoms that go along with the virus. This is not always the case though and when symptoms do occur they are often seen as a cluster of blister sores, usually on the vagina, vulva, cervix, penis, or anus. For genital , symptoms may last several weeks, go away but only to return again weeks, months, or even years later. Symptoms may also include pain in the infected area, itching, burning feeling if urine flows over sores, and possibly an inability to urinate if severely swollen from many sores. Very severe outbr ...
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... are about 150 known asteroids that travel in a path near the earth, and they are actually called, "near-earth" asteroids. About 10 percent are bound to hit earth eventually. Asteroids ranging from fine dust, to house size rocks make up the belt around Saturn, and the belt on the outside of the orbit of Mars. These are pieces of larger rocks that were crashed into the remaining pieces after millions of years of crashes. Each ring system has distinctive features. Jupiter's rings are tenuous and made mainly of dark particles the size of those in cigarette smoke. The bright rings of Saturn are made of mainly frozen water in the form of snowballs and chunks of i ...
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... Japan, obliterated three-fifth of the city within seconds and killed a total of 115,000 people in only a few minutes according to a local newspaper in Japan. Moreover, the second bomb being dropped at Nagasaki killed an average of 70,000 people. In these two blasts, entire families perished, leaving no one to report the death until four months from the catastrophe. This has made the Atomic Bomb the most powerful weapon ever invented in mankind. Secondly, countries that produce these bombs are harming others as well as themselves if there was war. For example, if a country fires an atomic bomb on another country, both of the countries will become affected wi ...
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