The organ system that obtains oxygen from the air and disposes of waster carbon dioxide back into the air is the system. PLS HELP

Which of the following departments would be included in a state government's public safety function? department of education department of emergency management department of environmental protection department of banking and consumer finance

Ascientist has predicted that the population of earth will continue to grow exponentially until the year 2300. at that point, we will reach carrying capacity of earth’s resources, and population growth will plateau. if the scientist’s prediction is correct, what can you predict about human energy use at that time? justify your answer by explaining the relationship between population growth and energy use. (5 points)

This is an ap world history question. i am working on a worksheet which has a vent diagram with each circle labeled either us or byzantine economy. the middle is the similarities. can someone explain to me the similarities and especially the differences between the two?