beaver and bison
Variation exists within the genes of every population or species as the result of natural selection. The other reason is due to neutrality of mutations.
In 1878 Western Canada was what is today Southwest, and a bit of Northern Ontario. It's population growth was the result of large Canadian families.
Blockprinting and handwriting books
Membership in the Knights of Labor declined.
If the shark population declined significantly, it would disrupt the food chain by causing an increase in the population of the prey species that the sharks feed on. This could lead to overgrazing of lower trophic levels, affecting the overall balance of the ecosystem. Additionally, the absence of sharks as top predators could result in changes to the behavior and distribution of other species within the food chain.
The species that is better adapted to the environment and able to acquire resources more effectively will likely outcompete the other species. This can lead to a decrease in population or even local extinction of the less competitive species.
A penalty is declined in football when the team that committed the penalty would benefit more from the result of the play than from the penalty yardage.
The football penalty was declined by the team because they chose not to accept the penalty and instead opted to keep the result of the play as it was.
Genetic drift, founder effect, and population bottlenecks are mechanisms that can decrease genetic diversity in a species. These mechanisms result in a reduction of variation within a population due to random events that affect the genetic makeup of the population.
poor diet and anxiety
This is an example of survival of the fittest.
Let's say, for example, a species overpopulates. The species will soon eat all of it's food sources (bearys, plants, etc.) Then, it will die out. As a result, The USA will no longer have the species.