1.Using and example, describe why a population could not increase for ever.
Population wouldn't be to increase if its caring capacity did int have enough resources to supply to more population. Also a population cant grow if it has a disease or problem that can affect the population when growing.
2. What are 2 factors that determine whether a population increases or decreases. (Use each factor in a one-sentence example).
If the population of a certain animal changes, the population of many other species will end up affected, and this will make the new animals eat more prey and lower another one. Population can be changed by diseases (decrease), hunting (increasing many preys by decreasing predators)
Example: Hunters starting hunting humming birds, they ate worms and were eaten by foxes. This will decrease the population of humming birds, making the amount of worms increase and the foxes to lower, affecting other animals.
3. Give a reason why the human population of Earth has continued to increase so much for the past hundred years?
Human population has increased so much during this years because of medicine, we have found the cure to many diseases that used to change the number of years we lived, curing lives and making us healthier, living longer life's.
Tuesday, October 21, 2014
Symbiosis is interaction between two or more species, can often involve food.
Types of Symbiosis:
Mutualism: Is the way two organisms of different kind exist together and benefit each other,
Example: The rabbits in Australia cooperate with the birds in that area for food, the birds bring far away found food while the rabbits catch fast running animals.
Commensalism: Symbiosis witch only one benefits the other while the other one nor benefits or harm.
Example: While the Trees give nutrients to insects and plants, they dosent harm or benefit the tree in any way, it only benefits the insects and plants.
Parasitism: The relashionship between two or more organisms were one is being benefit while the other one is being harmed.
Example: Humans benefit the diseases when getting them but are harm themselves.
Symbiosis may affect the food chain (we have been studying it in class) by lowering the resources that many animals use.
Friday, October 3, 2014
1. Why do we (as scientists) build food webs?
We build food webs to know how our actions against the environment will turn out to be, how what we hurt will influence other animals or elements of our ecosystem, it also shows us in a clear image how the animals that are in danger of extinction will make other differences in the environment when they are gone.
Example: The food web will show if we start killing the humming birds everything else in our environment will change, how the racoons that eat the humming birds will need to adapt. This animals will need to adapt by start eating other foods to stay alive.
2. Give an example of how one change might affect many other parts of an ecosystem.
A change affects everything near it, what it eats and what it is being eaten by. If the population of mice decreases the number of rabbits will also decrease since the snakes that use to eat the mice will need to start eating rabbits, if the population of mice and rabbits decreases, the number of crickets increases since not many animals will eat them. (It goes on and on)
3. Give an example of how one change in La Quebrada might affect the rest of the ecosystem.
If we start cutting the grass in La Quebrada it will affect the whole ecosystem. The grass that was being eaten by the snails will not be able to feed them anymore so the snails will die, since the humming birds ate the snails, they will need to start eating berries and the ammount of berries will decrease killing many of the omnivore espicies.