Which of the following is the best current estimate of the world's population?
a) between 7 and 8 billionb) between 5 and 6 billionc) more than 9 billiond) fewer than 1 billion

A. between 7 and 8 billion

Explanation:

The number of world's population started to dramatically accelerated after the agricultural revolution that created abundance of food in most countries. Judging from current growth rate, it is predicted that the number of world's population will get really close to 10 Billion people in 2050.

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.