The answer is either B or D I'm not completly sure but I'm leaning more towards B.
If I understand what you are asking, climate changed in the past because, just as now, there were greenhouse gas emissions. The key difference is that in the past, the way the green house gases circulated was natural<span>. The climate change threatened the organisms over time and will continue to do so in our future and present.</span>
Answer:
In a federal system, a national government and the state governments share power. In a unitary system, all power lies with the national government, whereas in a confederation, the majority of power rests with the states. In a federal system there is centralized authority, while in a confederal system power is distributed equally among the states.
Explanation: Examples: The United States, Australia, the Federal Republic of Germany. The Commonwealth of Independent States, formerly known as the Soviet Union. Also, Switzerland's canton system and the Confederate States of America (1861-1865).
B) Legislative bills are long detailed statements of the parties beliefs and goals that are written at the national convention
