I believe that the correct answer is D.)Animal Species
Animals reproduce , breed , and affect the agriculture.
Look up the word agriculture , you will see how my answer makes more sense.
My reason being is mainly because everything basically lives off of animals and if the are affected by anything and in any way start to decrease , the population will also.
I really hope that this helps you out a lot.
D. Backbones.
All of the animals listed are vertebrae, a classification of animals that means they have backbones. Fish do not have legs, lungs, or hair, and birds lack hair as well.
During the 1800s due to an economic and military weakness of the U.S compared to its neighbors the British, French and European rivals, the United States foreign policy makers sought diplomatic means to counter European presence.
The U.S diplomacy aimed at preventing France and Britain from accessing the control of more colonies in Latin America and Mexico which were a part of a declining Spanish empire.
Foreign policy goals previously focussed on gaining colonies and expansion to new territories, but, changed to developing commercial empires, limit the influence o the Soviet (USSR) and encourage more significant economic and political freedom.
Because it expressed the fact that Americans didn't want European countries that had economic or colonists interests to put a foot in the United States.
