Describe the three types of selection: directional, stabilizing and disruptive and give an example of each in your own words.
Directional Selection:
Tuesday, March 29, 2011
Blog 8
Your choice talk about something you learned or ask a question about something that is confusing you
The only thing that I do not understand, is how 99% percent of the Earths animals that have ever existed are now extinct. I dont understand how this can happen.
The only thing that I do not understand, is how 99% percent of the Earths animals that have ever existed are now extinct. I dont understand how this can happen.
Sunday, March 20, 2011
Blog #7
Compare and contrast two biomes describe them in detail include pictures of plants and animals you are liklely to see.
Grassland: Grasslands (also called savvanahs) are areas where the vegetation is dominated by grasses (Poaceae) and other herbaceous (non-woody) plants (forbs). However, sedge (Cyperaceae) and rush (Juncaceae) families can also be found. Grasslands occur naturally on all continents except Antarctica. In temperate latitudes, such as northwest Europe and the Great Plains and California in North America, native grasslands are dominated by perennial bunch grass species, whereas in warmer climates annual species form a greater component of the vegetation.[1]
Tundra: In physical geography, tundra is a biome where the tree growth is hindered by low temperatures and short growing seasons. The term tundra comes through Russian тундра from the Kildin Sami word tūndâr "uplands," "treeless mountain tract."[1] There are three types of tundra: Arctic tundra,[2] alpine tundra,[2] and Antarctic tundra.[3] In tundra, the vegetation is composed of dwarf shrubs, sedges and grasses, mosses, and lichens. Scattered trees grow in some tundra. The ecotone (or ecological boundary region) between the tundra and the forest is known as the tree line or timberline.
http://en.m.wikipedia.org/wiki/File:Greenland_scoresby-sydkapp2_hg.jpg
Grassland: Grasslands (also called savvanahs) are areas where the vegetation is dominated by grasses (Poaceae) and other herbaceous (non-woody) plants (forbs). However, sedge (Cyperaceae) and rush (Juncaceae) families can also be found. Grasslands occur naturally on all continents except Antarctica. In temperate latitudes, such as northwest Europe and the Great Plains and California in North America, native grasslands are dominated by perennial bunch grass species, whereas in warmer climates annual species form a greater component of the vegetation.[1]
Tundra: In physical geography, tundra is a biome where the tree growth is hindered by low temperatures and short growing seasons. The term tundra comes through Russian тундра from the Kildin Sami word tūndâr "uplands," "treeless mountain tract."[1] There are three types of tundra: Arctic tundra,[2] alpine tundra,[2] and Antarctic tundra.[3] In tundra, the vegetation is composed of dwarf shrubs, sedges and grasses, mosses, and lichens. Scattered trees grow in some tundra. The ecotone (or ecological boundary region) between the tundra and the forest is known as the tree line or timberline.
http://en.m.wikipedia.org/wiki/File:Greenland_scoresby-sydkapp2_hg.jpg
Sunday, March 13, 2011
blog #6
Which level of a food pyramid is the most important? Support your answer
I think that the most important level of a food pyramid is the first level. I believe this because without the first level, the second level wouldnt have anything to eat and without the second level having anything to eat it would die off. This would now cause the third level to have nothing to eat, which would cause them to die off as well. The bottom line is if the first level didnt exsist it would create a chain of extinction and this is why I believe that the first level is the most important.
http://www.food-faq.net/tag/food-pyramid http://image.wistatutor.com/content/feed/tvcs/tundra20food20pyramid.jpg
I think that the most important level of a food pyramid is the first level. I believe this because without the first level, the second level wouldnt have anything to eat and without the second level having anything to eat it would die off. This would now cause the third level to have nothing to eat, which would cause them to die off as well. The bottom line is if the first level didnt exsist it would create a chain of extinction and this is why I believe that the first level is the most important.
http://www.food-faq.net/tag/food-pyramid http://image.wistatutor.com/content/feed/tvcs/tundra20food20pyramid.jpg
Monday, March 7, 2011
Blog #5
There have been 5 major extinction events throughout history, are humans impacting the 6th? Why or why not?
I think that humans are greatly impacting the 6th major extinction. The way we are treating Earth has been terrible lately. Pollution has increased so much over the past 50 years. Every time we pollute the air we are endangering all sorts of animals. The polluting is effecting the climate that animals live in, its making the air dirtier causing animals to breath harder, etc. If we dont stop everything we've been doing or make a change I think we are going to cause many animals to go exstinct.
http://wellnessuncovered.com/joomla/index.php?option=com_content&view=category&layout=blog&id=1&Itemid=50&limitstart=100
I think that humans are greatly impacting the 6th major extinction. The way we are treating Earth has been terrible lately. Pollution has increased so much over the past 50 years. Every time we pollute the air we are endangering all sorts of animals. The polluting is effecting the climate that animals live in, its making the air dirtier causing animals to breath harder, etc. If we dont stop everything we've been doing or make a change I think we are going to cause many animals to go exstinct.
http://wellnessuncovered.com/joomla/index.php?option=com_content&view=category&layout=blog&id=1&Itemid=50&limitstart=100
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