diversity observed in the entire geographical area,is called gamma diversity,true or false?
546095
Depends on what you mean by "the entire geographical areas"...  Gamma diversity describes the diversity seen in an exremely large biome, such as an island, continent, or the arctic tundra, for example.
1065393
Yes.\nThere is a place where there are a lot of them.
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biodiversity is how many different types of organisms live in a area. And -it helps because it is less likely for invasion of insects. how are you because my class just finished having a test on this
1065286
If you know any scientists personally... they will pretty much tell you that it's a majority...not everyone, but there are all kind of crazy ideas in the outer realms of science that are minority beliefs...\n\nbut, just because a majority of the scientists think that it's true, doesn't mean that it is... it just means that all the current evidence points in one direction... that is one thing science proves over and over again...
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Estimates of the present global macroscopic species diversity vary from 2 million to 100 million species, with a best estimate of somewhere near 10 million. Note the word macroscopic, this excludes microscopic oragnisms.\n\nThe U.S. has over 17,000 identified native plant and tree species, including 5,000 just in California. With habitats ranging from tropical to arctic, the flora of the U.S. is the most diverse of any country; yet, thousands of non-native exotic species sometimes adversely affect indigenous plant and animal communities. Over 400 species of mammal, 700 species of bird, 500 species of reptile and amphibian, and 90,000 species of insect have been documented.\n\n Insects are the most diverse group of animals on the earth, with around 925,000 species described—more than all other animal groups combined. There's over a million arthropods, a group which includes insects.\n\nAbout 350,000 species of plants have been estimated to exist. As of 2004, some 287,655 species had been identified, of which 258,650 are flowering.\n\nI'm just adding them up.
1134630
yep...our earth does have a diverse environment!
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I could see 99%+.  I expect that they're doing a bit of statistical extrapolation (can't test everybody) and taking the upper range on their margin-of-error for journalistic sensationalism.  So, overall, probably.  \n\nConsider: DNA is DNA for every living thing (except perhaps a virus), so variations outside of a certain threshhold result in a different creature -- like aardvarks and komodo dragons.  Considering the diversity of life on earth, it should come as little surprise that the threshhold on DNA between one species and another is rather small (at least in comparison to the whole).
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Allopatric speciation - Speciation in different area due separation population by big mountains, oceans etc \n\nsympatric speciation - speciation in same  area due to gamete incompatibility, different times when they are active etc
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Yes.\nReality, as we accept, exists within a perceptible spectrum/frequency range. We can measure many other wavelengths that go unnoticed by humans. In a way, it's like insects that see in the UV or IR wavelengths. Their "reality", in this sense, is much unlike our own.\nScience has only identified X% of spectrums and, considering the numerous anomalies that occur on a regular basis, there is no telling what happens or exists in these undiscovered frequencies.\nThen again, I'm just a computer scientist, not a physicist.
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The Amazon Rainforest... South America. "Still discovering new species everyday in that region"
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Yes subject to Nat. Sel. as u can still see on Sudan swamps, tallest community of humans an the world, or Peruvians living high on the Andes where they have extra coding capacity for Hemoglobin.\n\nThe conditions you describe were studied theoretically by Hardy and Weinberg, so these conditions are called "Hardy-Weinberg equilibrium" and you can search it on almost any college level ecology text.\n\nWhat happens to the gene pool on such conditions? with no nat. sel., all "expensive" genes, ones that take a lot of energy to work, disappear or reduce strongly their presence, and a proff is that Capsicum annum or chili as you call it, when taken to spain from Mexico, lost its cappacity to produce capscin, the spicy oil that gives chili its strenght and in nature is a defense versus herbivorous insects not present on spain. And so on.
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the specific habitats of the certain populations of that species, like red squirels in the north where that particular coat color is more beneficial, and brown squirels in the south. You can also see the same thing in populations of fish in the gulf versus the same specie in the north atlantic...
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THE NICHE CONCEPT & ETHNIC DIVERSITY\n\n\nIntro\n\nOne of the striking facts about contemporary society, and indeed of much of recorded history, is the division of the human species into distinct ethnic groups, whose interrelations are sometimes antagonistic and sometimes mutualistic\n\nWhile there are many interesting ways social scientists analyze this phenomenon, ecological theory may provide some additional insights\n\nThis lecture approaches this topic as follows:\n\n1. What is ecological niche theory? (brief summary)\n2. How can we apply this theory to human ethnic diversity?\n3. Discussion of Swat case (Barth reading)\n\nCharacter displacement refers to the phenomenon where differences among similar species whose distributions overlap geographically are accentuated in regions where the species co-occur but are minimized or lost where the species’ distributions do not overlap. This pattern results from evolutionary change driven by competition among species for a limited resource (e.g. food). The rationale for character displacement stems from the competitive exclusion principle, also called Gause's Law, which contends that to coexist in a stable environment two competing species must differ in their respective ecological niche; without differentiation, one species will eliminate or exclude the other through competition.
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abundant = mostly found\n\nAreas of high rainfall and high sunlight, such as rain forests.
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The tropics or the equatorial regions,   are the geographic region of the Earth centered on the equator (parallel 0) and limited in latitude by the Tropic of Cancer in the northern hemisphere, at approximately 23°26' (23.4°) N latitude, and the Tropic of Capricorn in the southern hemisphere at 23°26' (23.4°) S latitude. This region is also referred to as the tropical zone and the torrid zone.\n\nThis area includes all the areas of the Earth where the sun reaches a point directly overhead at least once during the solar year. (In the temperate zones, north of the Tropic of Cancer and south of the Tropic of Capricorn, the sun never reaches an altitude of 90° or directly overhead.) The word "tropics" comes from Greek tropos meaning "turn", because the apparent position of the Sun oscillates between the two tropics with a period that defines the average length of a year.\n\nTropical plants and animals are those species native to the tropics. Tropical is also sometimes used in a general sense for a tropical climate, a climate that is warm to hot and moist year-round, often with the sense of lush vegetation. However, there are places in the tropics that are anything but "tropical" in this sense, with even alpine tundra and snow-capped peaks, including Mauna Kea, Mt. Kilimanjaro, and the Andes as far south as the northernmost parts of Chile and Argentina. Places in the tropics which are drier with low humidity are such as the Sahara Desert and Central Africa and Northern Australian Outback.\n\nTropical ecosystems may consist of rainforests, dry deciduous forests, spiny forests, desert and other habitat types. There are often significant areas of biodiversity and species endemism present particularly in rainforests and dry deciduous forests. Some examples of important biodiversity and/or high endemism ecosystems are: Costa Rican rainforests, Madagascar dry deciduous forests, Waterberg Biosphere of South Africa and eastern Madagascar rainforests. Often the soils of tropical forests are low in nutrient content making them quite vulnerable to slash-and-burn techniques, which are sometimes an element of shifting cultivation agricultural systems-.
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^^^ She's right. They are all sea life. \n\n\nBeyond that they have no commonality. They aren't even all from the same kingdom. Some are plants, some are animals, some are protists.
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A physiographic region is one that has similar landforms and similar evolutionary history