Wednesday, April 29, 2015
Monday, April 20, 2015
Overproduction is when a species has too many offspring so there wouldn't be enough resources for other species. The iguanas take most of the resources in Galapagos. The live in the water and in the land. So they get resources from both the sea and the land.
Variation is when there are many different types of the same species. In Galapagos there many types of lizards. Some live in water and others live in the land. They have different traits designed for different environments.
Adaptation is when a specie has to adapt to a different environment that it is used to. The Cormorant had to adapt to living in Galapagos because it was not used to diving underwater but then it adapted by developing the ability to swim underwater and losing the ability to fly.
Selection is when a specie survives in a environment because it is best suited for survival in that environment. For example, the lizards wouldn't be able to survive in big cities like Miami because they wouldn't find there food there compared to other smaller iguanas that live in Miami.
Speciation is when a new specie is formed because a population of a specie evolved differently than a population of the same specie so they couldn't reproduce with the other population. Different species of finches evolved on Galapagos to adapt to the kind of food it eats. That happened because they had to adapt to different types environment.
Isolation is when a specie is completely apart from other species. An example of isolation is the Galapagos islands because all the species there were completely ignored and isolated from the rest of the world. That is why the species in Galapagos were able to evolve.
Sunday, April 19, 2015
In wildlife there are many different types of natural selection. For example artic foxes' coats turn brown in the summer and white in the winter. If the coat would remain brown then predators would find it easier to see the foxes. A lot of species need natural selection to survive. Every animal has a variety of traits that are necessary for their survival. If you put a polar bear in the forest with a brown bear, the hunters would find it easier to hunt the polar bear because of their coats. Then the brown Bears will have offspring and the polar bears would try to evolve to adapt into the forest.