123 adaptation
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i. .Adaptationis the evolutionary process
whereby an organism becomes better
able to live in itshabitat or habitats.
b. . Adaptednessis the state of beingadapted: the degree to which an organism isable to live and reproduce in a given set ofhabitats
http://en.wikipedia.org/wiki/Habitathttp://en.wikipedia.org/wiki/Habitat -
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Polar ecologyis the relationship between plants and animals in
polar environment. Polar environments are inheArcticandAntarcticregions. Arctic regions are in theNorthern
Hemisphere,and it contains land and the islands that surrounds
.Antarcticais in the Southern Hemisphereand it also contains
he land mass, surrounding islands and the ocean. Polar
egionsalso contain the subantarctic andsubarcticzone which
eparate the polar regions from thetemperate regions. Antarctica
nd the Arctic lie in thepolar circles. The polar circles are not
isible on the earth but it is shown on maps to be the areas that
eceives less sunlight due to less radiation. These areas either
eceive sunlight (midnight sun) or shade (polar night) 24 hours a
ay because of the earth's tilt. Plants and animals in the polaregions are able to withstand living in harsh weather conditions
ut are facing environmental threats that limit their survival.
http://en.wikipedia.org/wiki/Arctichttp://en.wikipedia.org/wiki/Antarctichttp://en.wikipedia.org/wiki/Northern_Hemispherehttp://en.wikipedia.org/wiki/Northern_Hemispherehttp://en.wikipedia.org/wiki/Northern_Hemispherehttp://en.wikipedia.org/wiki/Northern_Hemispherehttp://en.wikipedia.org/wiki/Antarcticahttp://en.wikipedia.org/wiki/Southern_Hemispherehttp://en.wikipedia.org/wiki/Polar_regionhttp://en.wikipedia.org/wiki/Polar_regionhttp://en.wikipedia.org/wiki/Subarctichttp://en.wikipedia.org/wiki/Subarctichttp://en.wikipedia.org/wiki/Temperate_regionhttp://en.wikipedia.org/wiki/Temperate_regionhttp://en.wikipedia.org/wiki/Polar_circlehttp://en.wikipedia.org/wiki/Polar_circlehttp://en.wikipedia.org/wiki/Midnight_sunhttp://en.wikipedia.org/wiki/Polar_nighthttp://en.wikipedia.org/wiki/Earth#Axial_tilt_and_seasonshttp://en.wikipedia.org/wiki/Earth#Axial_tilt_and_seasonshttp://en.wikipedia.org/wiki/Polar_nighthttp://en.wikipedia.org/wiki/Midnight_sunhttp://en.wikipedia.org/wiki/Polar_circlehttp://en.wikipedia.org/wiki/Temperate_regionhttp://en.wikipedia.org/wiki/Subarctichttp://en.wikipedia.org/wiki/Polar_regionhttp://en.wikipedia.org/wiki/Polar_regionhttp://en.wikipedia.org/wiki/Southern_Hemispherehttp://en.wikipedia.org/wiki/Antarcticahttp://en.wikipedia.org/wiki/Northern_Hemispherehttp://en.wikipedia.org/wiki/Northern_Hemispherehttp://en.wikipedia.org/wiki/Antarctichttp://en.wikipedia.org/wiki/Arctic -
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The two mainadaptations that desert animals must make are how to deal with lack of waterand
how to deal with extremes in temperature. Many desert animals avoid the heatof the desert by simply staying out of it as much as possible.
Where do animals in the desert get their water from?
Since water is so scarce, most desert animals get their water from the food they
eat: succulent plants, seeds, or the blood and body tissues of their prey.
How do desert animals prevent water from leaving their bodies?
Desert animals prevent water leaving their bodies in a number of different ways.Some, like kangaroo rats and lizards, live in burrowswhich do not get too hot or
too cold and have more humid (damp) air inside. These animals stay in theirburrows during the hot days and emerge at night to feed.
Other animals have bodies designed to save water. Scorpions and wolf spiders have
a thick outer covering which reduces moisture loss. The kidneys of desert
animals concentrate urine, so that they excrete less water.
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Several animalgroups have undergone aquatic
adaptation, going from being purely terrestrial
animals to living at least part of the time in water.
The adaptationsin early speciation tend to develop as
he animal ventures into water in order to find
available food. As successive generations spend more
me in the water, natural selection causes the
acquisition of more adaptations. Animals of later
generations may spend the majority of their life in the
water, coming ashore for mating. Finally, fully adaptedanimals may take to mating and birthing in water.
http://en.wikipedia.org/wiki/Animalhttp://en.wikipedia.org/wiki/Adaptation_(biology)http://en.wikipedia.org/wiki/Adaptation_(biology)http://en.wikipedia.org/wiki/Animal