Apopulation of oak trees is separated by a large canyon. which of the following is most likely to occur? the two populations will show cospeciation. the genetic variation between the two populations will increase. natural selection will cause one population to die, and the other to live. both populations will stop evolving.

the two populations will show cospeciation

Explanation:

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them