Theories of Biology

Theories of Biology
Tina Smigelski
August 19,2011
Gail Albritton

Theories of Biology
There are 7 different theories to Biology. I will list them and give a brief description of them. I will also provide an example of one of them and how they relate to the news of today.
The first is Evolution by Natural Selection. This can be described in two different parts with the first trying to explain why there are so many different species and the second is how these species can evolve and change through generations.
The second is Inheritance. This is where characteristics and traits are passed from one generation to the next by way of heredity or through the passing of genes.
The third is Cells. All organisms come from cells which come from other preexisting cells. Each cell is capable of showing all the characteristics of life.
The fourth is Biological Classification. Organizing and keeping track of different species by using similarities and differences to classify them.
The fifth is Bioenergetics. This is the power or energy that life operates by. Also includes the chemical reactions in cells.
The sixth is Homeostasis. This is an organism’s ability to tolerate a wide variety of external conditions by being able to maintain and stabilize internal conditions.
The seventh is Ecosystems. This is where organisms function with other organisms and make up communities of different living environments which may include nonliving features. They interact with each other and may cause changes in other parts of their environment.
One example of an Ecosystem is the melting ice in Antarctica which is affecting the Emperor Penguins there.   The sea ice there is an important factor in the ecosystem since it is a feeding ground for tiny crustaceans that thrive on the algae that grows on the underside of the ice. The other animals such as the penguins, fish, seals, and whales use the crustaceans as a food source. With the drastic changes in the climate the ice is...