Vhich of the following is an example of why humans need plants? OA) Plants can convert carbon dioxide into oxygen.
B) Plants provide food for animals.
C) People could survive without plants, but it is easier to live with them.
OD) A and B only

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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.

permafrost layer, it exists beneath a layer of soil, rock or sediment.