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.
there will be a reduction in the population size of one or both species..
Membership in the Knights of Labor declined.
Blockprinting and handwriting books
No, slave labor increased in the Americas as a result of the Age of Exploration. European powers relied on enslaved labor to exploit the resources of the New World, leading to the transatlantic slave trade and the establishment of plantation economies.
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.
poor diet and anxiety
competitive exlusion
Economic productivity has declined in some countries due to low demand and increase in the rate of Inflation.
Over-fishing does not simply reduce the population and future population of a species. It can also result in overpopulation of the organisms on which they feed, and changes to the species that feed on them. In some cases, there are opportunistic species that take advantage of the reduced numbers of a given species, and these invaders may cause further harm to the ecosystem, and to the human activities that depend on the ecosystem.