Many dogs bark when unknown individuals approach their house. what type of interaction is this
a. mutualism
b. predation
c. symbiosis
d. competition

Where were many of the arab trade routes established during the middle ages? a. by nile river delta b. near rivers and the coast c. along the persian gulf d. in the arabian desert

How does désir represent the diversity of europe today? how did the 1400s and 1500s affect the religious diversity of europe? how might cultural diversity in a place like germany affect everyday life? what are two reasons some europeans might find immigration to be an advantage? what are two reasons some might find it to be a disadvantage? why do you think languages and culture spread more easily in europe now than in the past?

The colors at sunset are usually the result of raindrops