Thursday, November 19, 2009

3 Factors That Lower Biotic Potential

There are many factors that lower biotic potential but there are three that are the most significant factors in my opinion. Biotic potential is the maximum reproductive capacity of a population under optimum environmental conditions. Environmental resistance restricts full expression of biotic potential. The three factors that do this are famine, natural disasters, and weather.


Biggest Impact Humans Have Had on the Planet

After watching Earth After People, I think that without humans, the earth would go back to the way it was before when there was no buildings or signs of civilizations. Animals would run free and live by the idea of survival of the fittest. The world would be darker because there would be no electricity or light. I think the biggest impact that humans have on the planet is our ability to control areas and build things on top of it. We don't let things such as plants or trees take over the planet but instead we make things organized. We also have negative impacts on the planet such as pollution and overusing the earth's resources.

Thursday, November 5, 2009

Individual characters/Population sizes

Individual characters of animals affect their population sizes. This can be seen in the studies of Darwin during his stay at the galapagos islands. He studied finches in all the islands and he saw that the finches had different characteristics because they had to adapt to the environment around them. So for certain islands, only a certain kind of finch with features and characteristics that fit the surroundings would be found in a large population while other finches would have low or no populations in those areas.


Four Types of Competition

There are four types of competition in the environment that exist within the animal kingdom. These types of competition determine which animals are superior and get to thrive within a certain area in a specific area. Intraspecific competition is the competition for resources between two of the same species. An example of this is two guys fighting for one girl or two of the same birds fight for one nest. Interspecific competition is the competition for resources between two different species. An example of this type of competition is a cat and dog fighting over a bowl of food.